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UNESCO-listed Medieval City of Rhodes · south walls, boundary of the Posts of Provence and England

The Tower of St John

Also known as the Gate of Koskinou or Kizil Kapou, the “Red Gate” — a fortified gate-and-tower complex begun in 1421 under Grand Master Antoni Fluvian and built up over some eighty years by six further Grand Masters, judged by the dedicated 1996 academic study “perhaps the most characteristic nodal point for the identification of transitional defensive forms” on the whole Rhodian enceinte.

“Perhaps the most characteristic nodal point for the identification of transitional defensive forms… the strongest point of the enceinte” Kasdagli & Manoussou-Della, “The Defences of Rhodes and the Tower of St John,” 1996

Exceptional High Moderate
00
Identity

Eight Phases, Eighty Years, One Gate

South walls, Koskinou road › boundary of the Posts of Provence and England

Location & setting
South stretch of the fortified circuit of the Medieval Town of Rhodes, at the boundary between the historic Posts (langue sectors) of Provence and England, opening onto the road to the village of Koskinou; per Katerina Manousou-Ntella’s 2013 doctoral dissertation, the second-highest point in the medieval town after the Grand Master’s Palace.
Type
A fortified gate-and-tower complex: a rectangular tower open at the back (“ouvert à la gorge”) flanking an inner, portcullis-secured gate, progressively enclosed by a pentagonal outer bulwark and, from 1480, a massive outer bastion with drawbridge and stone bridge over a wide ditch; today the principal vehicular and pedestrian gate on the south walls.
Also known as
The Gate of Koskinou, after the village its road leads to; and, in Ottoman-period usage, Kizil Kapou, the “Red Gate.”
Heritage designation
Component of the “Medieval City of Rhodes” UNESCO World Heritage property (inscribed 1988, criteria ii, iv, v); protected under Greek Archaeological Law 3028/2002.
Present use
Vehicular and pedestrian gate on the south walls, giving access to the modern road to Koskinou; the wider bastion complex is a protected archaeological monument administered by the Ephorate of Antiquities of the Dodecanese.
01
Architecture

From an Isolated Tower to a Gunpowder Bastion

Fluvian’s tower to d’Aubusson’s bastion › eight phases read directly from the fabric

Fluvian’s tower and the Baptist relief
The oldest and most securely dated element: a rectangular tower, open at the back like the other early Hospitaller wall towers, its south face carrying a large pointed-arch doorway above which are set Fluvian’s coat of arms and a relief of St John the Baptist — the tower’s namesake and the patron of the Hospitaller Order itself.
Lastic’s portcullis gate and second tower
Jean de Lastic sealed the tower’s open rear with a gate secured by a portcullis — the “Porte Bolevert” of a 1465 document — and built a second, similarly exposed rectangular tower immediately to its west, also bearing his arms.
Zacosta’s bulwark and Orsini’s battery
Ramon Zacosta added an early pentagonal bulwark around the central tower, forcing the entry route to divert around rather than through it; Giambattista degli Orsini then joined the tower to the main curtain wall with a two-level artillery battery built over Lastic’s gate passage.
D’Aubusson’s outer bastion
After the Great Siege of 1480, Pierre d’Aubusson added a massive outer bastion for large cannon, partly reusing Orsini’s earlier counterscarp, pierced by an outer gate with its own drawbridge and a stone bridge crossing a wide new ditch — substantially the form in which the complex survives today.
Later recalibration
Emery d’Amboise added an annexe, probably a guardhouse, to the south-west of the gate complex; Fabrizio del Carretto thickened the curtain wall, reinforced the vault of the complex’s chapel for the packed earth this required, and modified d’Aubusson’s embrasures for newer ordnance, with further repairs directed there in 1520 by Basilio dalla Scuola.
02
History

Seven Grand Masters, One Building Programme

1421–1521 › each phase dated by surviving heraldry

Fluvian, 1421–1437
Began the systematic extension of Rhodes’ landward defences to the west and south of the town; the rectangular tower that gives this complex its name was its easternmost point, built on elevated ground that explains the documented transfer of the fortified corner from the earlier Byzantine line to this point.
Lastic, 1437–1454
Sealed the tower’s open rear with a portcullis-secured gate and built a second rectangular tower to the west; died in 1454 before completing the new land wall this phase required.
De Milly, 1454–1461
Finished Lastic’s wall in 1457, commemorated by a surviving bilingual inscription naming the master mason Manolis Kountis; built the present inner town gate and the staircase giving access to the wall-walk.
Zacosta, 1461–1467
Added the early pentagonal bulwark around the central tower — a reinforced fausse braie with intermediate-level gun emplacements, comparable to bulwarks later enclosed within the bastions of St George and St Athanasios — requiring the entry route to divert around Fluvian’s tower.
Orsini, 1467–1476
Built the two-level artillery battery that finally joined Fluvian’s isolated tower to the main curtain wall, closing the dead ground between them, and remodelled the access staircase, on which his arms survive.
D’Aubusson, 1476–1503
After the Great Siege of 1480, made what the dedicated academic study calls “possibly the greatest contribution to the evolution of the fortifications” of Rhodes as a whole: the massive outer bastion, drawbridge and stone bridge that give the complex substantially its present form.
D’Amboise, 1503–1512
Built an annexe, probably a guardhouse, to the south-west of the gate complex — a more limited addition than his predecessor’s.
Del Carretto, 1512–1521
Closed the eighty-year sequence: thickened the curtain wall, reinforced the chapel vault, and modified d’Aubusson’s embrasures for newer ordnance, with further repairs directed by Basilio dalla Scuola in 1520, on the eve of the decisive siege.
03
Testimony

“The Strongest Point of the Enceinte”

Kasdagli & Manoussou-Della, 1996 › a dedicated structural and historical survey, and what it does not cover

A nodal point, read structurally

The 1996 study — undertaken specifically because acute structural danger at this complex called for shoring and restoration, and accordingly combining documentary, heraldic and archaeological evidence with a full structural survey — describes the Tower of St John as “perhaps the most characteristic nodal point for the identification of transitional defensive forms” in the whole Rhodian enceinte: a judgment framed by the authors’ own direct structural survey of the fabric, and the basis this document uses for an Exceptional representativeness rating, not awarded lightly.

Kasdagli & Manoussou-Della, “The Defences of Rhodes and the Tower of St John,” Fort, Vol. 24 (1996).
“Regularly in the thick of the fighting”

By the decisive Ottoman siege of 1522, the Tower of St John was, per the dedicated academic study, one of at most three land gates on the landward defences still operational, and was “regularly in the thick of the fighting.” The city’s capitulation later that year is attributed in the same study not to any structural failure of defences such as this one, but to the exhaustion of the defenders’ gunpowder.

Kasdagli & Manoussou-Della, 1996; the siege of Rhodes, 1522.
A sourcing caveat, stated plainly

This document draws principally on the 1996 study, supplemented by Katerina Manousou-Ntella’s 2013 doctoral dissertation and her related 2007 book chapter on the medieval gates of Rhodes town. Two of these three sources share a lead author — Katerina Manousou-Ntella and Manoussou-Della are the same scholar, her name appearing with both transliterations across her publications — and so do not constitute fully independent corroboration in the strictest sense. Her sustained, multi-decade, structurally-grounded study of this one monument nonetheless represents an unusually deep evidentiary base by the standards of this project.

Sourcing note, as stated in this document’s own source material.
A table of contents promising more than the text delivers

The source document’s own table of contents lists further subsections — on the Grand Master’s Garden, the bastion as a heritage landscape today, Ottoman repair and nineteenth-century damage, a 2000–2015 restoration programme, the bastion’s functional reintegration, and a 2011–2015 restoration culminating in a 2017 Europa Nostra award — none of which appear in the body text supplied for this document. This Statement is built from the text actually delivered, and notes the gap rather than inventing the missing narrative.

Editorial note on the source document, this project.
04
Story

Who Am I?

A first-person telling › the tower’s own eighty-year story, in its own voice

Who Am I?

I was born in the year 1421, out of a block of pale Rhodian stone, on the highest ground anyone could find at the southern edge of a walled town by the sea. A man named Antoni Fluvian made me. He was the Grand Master of a whole order of warrior-monks called the Knights of Saint John — and he had big plans for the little town of Rhodes. He raised me up as a tall, square tower, open at the back like a cupboard with no door, so that if an enemy ever somehow got inside me, my own friends on the wall could still see straight through. Over my front door he carved his own coat of arms, so everyone would know who had built me. And right beside it, he carved a picture of a man with wild hair and a cloak made of animal skin: Saint John the Baptist, the patron saint of the whole Order. That is where I got my name. I am the Tower of Saint John.

I did not know it yet, but I would spend the next eighty years growing up. First came Jean de Lastic. He built a wall across my open back and fitted it with a spiked iron gate called a portcullis, which could drop down like a row of teeth to block anyone from getting through. People started calling that gate the Porte Bolevert. Lastic also built me a twin — a second tower just to my west, wearing his own coat of arms instead of Fluvian’s.

Then came Jacques de Milly, who finished the whole stretch of new wall around us in the year 1457. The stonemasons were so proud of their work that they carved an inscription into the stone, naming the master builder himself: Manolis Kountis. You can still read his name today, carved in two languages, nearly six hundred years later.

Then came Ramon Zacosta, who wrapped a five-sided wall called a bulwark around me, with little platforms partway up for soldiers to stand on with their crossbows and early guns. Zacosta’s bulwark was so wide that anyone wanting to reach my front gate could no longer walk straight at me — they had to detour around, which is exactly what Zacosta wanted. A tower that is hard to even walk up to is a tower that is hard to attack.

Then came Giambattista degli Orsini, who finally joined me to the rest of the great wall with a two-storey platform built for cannons, arching right over the top of Lastic’s old gate passage. For the first time since I was built, I was not standing alone anymore. I was part of something enormous.

Told in the tower’s own voice, covering Fluvian (1421–1437) through Orsini (1467–1476); supplied by the user for this document, not drawn from the source docx.
The Year Everything Changed

In the summer of 1480, a vast army arrived by sea. Tens of thousands of Ottoman soldiers surrounded Rhodes, dragging cannon taller than houses, determined to take the city by force. I watched, and I waited, and I listened to the thunder of their guns — but that time, the worst of the fighting happened somewhere else, at a fort called Saint Nicolas, guarding the harbour, and at another tower by the windmills. Those two held firm under bombardment so fierce it amazed everyone who saw it, and the invaders finally sailed away, defeated.

The Grand Master who led that victory, a knight named Pierre d’Aubusson, understood something important: cannon were going to change everything about how walls needed to be built, forever. So afterward, he came to me. He wrapped me in an enormous new outer wall called a bastion, thick enough to shrug off cannonballs, with a brand-new outer gate, a drawbridge, and a stone bridge crossing a deep new ditch. He even turned my old front wall into a gun platform of my own. I had grown from a single lonely tower into a small fortress in my own right.

Two more Grand Masters kept working on me after that. Emery d’Amboise built a little guardhouse beside my gate. And Fabrizio del Carretto, the last to work on me, thickened my walls even further and reinforced the stone ceiling of my chapel so it could bear the weight of all the earth now piled on top of it for the cannon to stand on. In the year 1520 — just two years before I would need it most — a builder named Basilio dalla Scuola came and made his own final repairs to my gun openings, so they could fit the newest, most powerful cannon of the age.

Nobody told me so in words, but by then I understood. I had not been built to look beautiful, though I was. I had not been built to be tall, though I was that too. I had been built, stone by stone, gift by gift, for eighty years, by seven different men who would never meet each other, for one single reason: because someday, someone was going to try to break through me, and when that day came, I needed to be ready.

Told in the tower’s own voice, covering the Great Siege of 1480 and the building work of d’Aubusson, d’Amboise and del Carretto to 1520; supplied by the user for this document, not drawn from the source docx.
The Night I Was Tested

The day came in 1522. Suleiman the Magnificent, the most powerful sultan the Ottoman Empire had ever had, brought a force so large that the old soldiers of 1480 would hardly have believed it. This time, his engineers studied the walls of Rhodes carefully first — and they picked me.

By then, I was one of only three gates in the whole landward wall still strong enough to be useful at all. The old stories written about that siege say plainly that my post “was regularly in the thick of the fighting.” I do not need to exaggerate what that meant. Cannonballs struck my walls so often that, centuries later, archaeologists digging inside my oldest breastwork — the very first stones Fluvian ever laid — found a pile of stone cannonballs still sitting exactly where they had struck, half-buried in the rubble, waiting for someone to find them.

Soldiers fought and bled at my gate for months. The ground in front of me shook from gunpowder mines dug under my walls by enemy sappers, and from the counter-mines the knights dug back to stop them. Through all of it — everything that eighty years of seven Grand Masters had built into me — I held. I did not fall. Not one stone of me gave way to the enemy. And yet the city fell. But I am still here.

So, the next time someone tells you that a thing took too long to build, or that growing stronger takes too many small steps, you can tell them about me. It took eighty years and seven different builders, none of whom lived to see the day it would matter, to make me strong enough for one single night in 1522. And when that night came, I was ready.

Told in the tower’s own voice, covering the siege of Rhodes, 1522; supplied by the user for this document, not drawn from the source docx.
05
Conservation

What the 1996 Survey Found Underground

Archaeology beneath the bastion › two moats, stone shot, and a gap the sources do not fill

An older moat, and an older moat still
Excavation associated with the 1996 survey recovered an early moat predating Milly’s 1457 gate, and the tail-end of a still older moat beneath it — physical evidence of defensive work on this site before the building sequence this document otherwise documents.
Stone shot in Fluvian’s breastwork
A quantity of stone cannonballs was recovered in situ within Fluvian’s early breastwork — tangible physical evidence of the bombardment the complex’s eighty years of rebuilding were designed, ultimately successfully, to withstand.
The remains of the “porte bolevert”
The excavation also identified remains of an early bulwark corresponding to the “porte bolevert” recorded in the 1465 document, independently corroborating the documentary reference to a defensive feature “quite near the gate of Koskinou.”
The 1520 repairs
On the eve of the decisive 1522 siege, further repairs to d’Aubusson’s bastion embrasures were directed by Basilio dalla Scuola in 1520 — the last documented building work before the complex was tested in earnest.
A gap in the record
No restoration narrative, materials analysis, or condition report for any modern (2000s-era) conservation campaign is given in the sources consulted for this document, although the source document’s own table of contents indicates such a campaign took place. This document notes the gap rather than resolving it.
06
Gallery

Photo Gallery

Five views › the tower, its setting, and the gate and bridge it anchors

07
Assessment

Significance Criteria

Nine-criteria framework › International importance

Rarity
One of several major fortified gates in the Hospitaller circuit, but its eight-phase, eighty-year building sequence — precisely datable by successive Grand Masters’ heraldry — is unusually complete and complex among the gates documented in the sources consulted for this project.
High
Representativeness
Described by the dedicated academic study as “perhaps the most characteristic nodal point for the identification of transitional defensive forms” in the whole Rhodian enceinte — a judgment by the specialists who surveyed it directly.
Exceptional
Aesthetic value
Rests on Fluvian’s surviving coat of arms and the relief of St John the Baptist above the original tower doorway, the further heraldic display of five more Grand Masters across the complex’s later phases, and the picturesque, multi-layered silhouette this long building sequence has produced.
High
Integrity
Retains substantially its full multi-phase structure — from Fluvian’s original tower through d’Aubusson’s outer bastion — without the large-scale demolition or modern widening recorded at some other Rhodian gates documented in this project.
High
Historical value
Subject of a dedicated peer-reviewed structural and historical study, corroborated by a doctoral dissertation and a further book chapter, which together precisely date eight successive building phases and identify the complex as the strongest point of the enceinte in the decisive siege of 1522.
Exceptional
Symbolic, spiritual & social value
Named for St John the Baptist, the Hospitaller Order’s own patron, and marking the principal gate through which the town connected with its southern countryside, reinforced by its recorded role as the site of the fiercest fighting on the landward walls in 1522.
High
Scientific value
Direct subject of dedicated archaeological excavation and structural survey, recovering an early moat older than Milly’s gate, a still older moat beneath it, stone cannonballs in situ within Fluvian’s breastwork, and the remains of the 1465 “porte bolevert.”
Exceptional
Interpretive potential
A clearly datable, colour-codable eight-phase sequence, each phase attributable to a named Grand Master by surviving heraldry, offering visitors a direct reading of the physical development of Hospitaller military architecture from the fabric of a single monument.
Exceptional
Importance level
International significance, as a named component gate of the fortified circuit within the Outstanding Universal Value of the UNESCO-inscribed Medieval City of Rhodes, supported by an unusually strong evidentiary basis among the monuments documented in this project.
International

Statement of significance

“Perhaps the most characteristic nodal point for the identification of transitional defensive forms… the strongest point of the enceinte.” (Kasdagli & Manoussou-Della’s own structural and historical assessment of the complex, 1996 — not a period inscription.)

The Tower of St John — known also as the Gate of Koskinou or Kizil Kapou, the “Red Gate” — is a Hospitaller-period fortified gate-and-tower complex on the south stretch of the Medieval Town of Rhodes’ fortified circuit, at the boundary between the Order’s Tongues of Provence and England, giving access to the road to Koskinou. Begun in 1421 under Grand Master Antoni Fluvian, whose coat of arms and a relief of St John the Baptist mark the original tower’s south face, the complex was progressively enclosed and strengthened over some eighty years by six further Grand Masters — Lastic, de Milly, Zacosta, Orsini, d’Aubusson, d’Amboise and del Carretto — each phase precisely dated by surviving heraldry, culminating in d’Aubusson’s massive outer bastion, drawbridge and stone bridge built after the Great Siege of 1480. By the decisive siege of 1522 the complex was, per the dedicated academic study, one of at most three land gates still operational and “the strongest point of the enceinte,” regularly in the thick of the fighting before the city’s eventual capitulation. Taken together, this history gives the Tower of St John significance of International importance as a named component of the Outstanding Universal Value of the UNESCO-inscribed Medieval City of Rhodes under criteria (ii), (iv) and (v), resting on an unusually strong evidentiary basis among the monuments documented in this project: a dedicated peer-reviewed structural and historical study, corroborated by a doctoral dissertation and a further book chapter, notwithstanding their shared lead authorship.

National

ΥΑ 23084/737/25-8-1948 — ΦΕΚ 10/23-9-1948 (Ministerial Decision declaring the monuments of the Medieval Town of Rhodes, including the Tower of St John, protected under Greek Archaeological Law), subsequently confirmed under Law 3028/2002.

UNESCO

World Heritage property: Medieval City of Rhodes (ref. 493), inscribed 1988, meeting criteria (ii), (iv) and (v). A contributing component monument of the property, alongside the Palace of the Grand Master, its Bastion, the Bastion of St George, the Gate of the Arsenal, and the Moat of the Medieval Town of Rhodes.

References

  1. Kasdagli, Anna-Maria, and Katerina Manoussou-Della. “The Defences of Rhodes and the Tower of St John.” Fort: The International Journal of Fortification and Military Architecture, Vol. 24 (1996), pp. 15–34. Fortress Study Group; peer-reviewed. Read in full for this document (offprint supplied for this project). The primary source for this Statement: the complex’s eight-phase, eighty-year building chronology under seven successive Grand Masters, its architectural features, its role as the strongest point of the enceinte in the siege of 1522, and the archaeological findings of the 1996 conservation-led survey.
  2. Manousou-Della, Katerina. “Medieval Gates in Rhodes Town: A Morphological Analysis” [Greek: “Μορφολογικά στοιχεία των μεσαιωνικών πυλών της πόλης της Ρόδου”]. In Olga Gratziou (ed.), Sculpture and Stone-Carving in the Latin East, 13th–17th century [Γλυπτική και Λιθοξοϊκή στη Λατινική Ανατολή, 13ος–17ος αιώνας]. Rethymno/Heraklion: Crete University Press, 2007, pp. 218–243. Peer-reviewed book chapter, already held by this project and used for its Gate of the Arsenal Statement. Consulted here for its independent description of the complex as the most characteristic pylon arrangement reproducing patterns of the Order’s past in the Latin East, comparable to Krak des Chevaliers, and for its corroboration of the complex’s identification as the “Red Gate”/Gate of Koskinou and its Fluvian-period heraldic dating.
  3. Manousou-Ntella, Katerina. “Η πόλη της Ρόδου κατά τους μεσαιωνικούς χρόνους” [“The City of Rhodes in the Medieval Period: The Transformation of the Fortifications from Late Antiquity to the Hospitaller Fortified City (7th c.–1480)”]. PhD dissertation, National Technical University of Athens, School of Architecture, October 2013. Pages 244–250 (as paginated in the copy consulted) read for this document. Consulted for further technical and archaeological detail, including the sequence of early moats and bulwarks revealed by excavation and the later infilling of the central tower under d’Aubusson and Orsini; the author is the same person as “Manoussou-Della” above, the difference being alternative transliterations of her Greek surname.
  4. Abercrombie, G.E. The Hospitaller Knights of St John in Rhodes 1306–1522, Military. Barnsley, UK: Pen and Sword, 2024.
  5. Nossov, K. The Fortress of Rhodes 1309–1522. Osprey Publishing, 2010.
  6. UNESCO World Heritage Centre. “Medieval City of Rhodes.” World Heritage List, ref. 493. Inscribed 1988.
  7. ICOMOS. ICOMOS Charter for the Interpretation and Presentation of Cultural Heritage Sites. Paris: ICOMOS, 2008.
  8. ICOMOS Australia. The Burra Charter: The Australia ICOMOS Charter for Places of Cultural Significance. Burwood: ICOMOS Australia, 2013.
  9. Hellenic Government Gazette (ΦΕΚ). Ministerial Decision 23084/737 (25 August 1948), ΦΕΚ 10 (23 September 1948); Law 3028/2002 on the Protection of Antiquities and Cultural Heritage in General.
  10. REBOOT Statement of Significance: Gate of St John, Rhodes (2026) — a separate Statement of Significance for what this document’s sources identify as the same gate-and-tower complex, built from a different source document with its own distinct building chronology and a dedicated narrative section on the Posts of England and Provence in the 1522 siege. This document does not attempt to reconcile the two; both are presented as supplied by their respective sources.
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