The House of Prince Jem

Identity

Site & dates

Museum › Street of the Knights, Collachium

Stands on the Street of the Knights (Odos Ippoton) in the Collachium, close to the Palace of the Grand Master, in two connected sections either side of a vaulted lane.

1481

Built, or substantially completed, under the supervision of the Knight Hospitaller Jean d’Aussay, whose carved coat of arms survives on the façade.

1482

Lodges the fugitive Ottoman prince Jem Sultan for around five weeks, at the invitation of Grand Master Pierre d’Aubusson.

1514

Substantially reconstructed after damage from the First Siege of Rhodes (1480) and the earthquake of 1481; a Renaissance entrance doorway rebuilt and dated by an inscription, no longer legible today.

1912 – today

Upper floor rebuilt again under Italian administration after 19th-century earthquake and explosion damage; Greek state ownership from 1947/48; restored as an archaeological monument, free to visit until 15:00.

Diplomacy

The most expensive captive

1482–1489 › the most expensive captive of his century

Sultan Bayezid II paid the Order some 45,000 gold ducats a year — roughly € 23 million Euros today — to keep his brother safely, and profitably, far away from pressing his claim to the Ottoman throne.

Flight to Rhodes, 1481–82

Defeated by his brother near Yenişehir and unable to reach Egypt, Jem took refuge at the Hospitallers’ castle of St Peter and sought Grand Master Pierre d’Aubusson’s protection.

The ceremonial reception

Received by lords of the Grand Cross to cannon salutes, Jem processed on a magnificent horse to the church of S. Sebastiano, where d’Aubusson waited amid his assembled knights.

The cost of a royal captive

Bayezid agreed 45,000 ducats a year for Jem’s custody; per Halil İnalcık’s research, only 35,000 was earmarked for Jem himself, the remaining 10,000 — and further undisclosed sums — going to d’Aubusson personally.

Detail of Pinturicchio's 1492 fresco The Disputation of St Catherine, showing Jem Sultan beside Lucrezia Borgia depicted as St Catherine — Jem Sultan (turbaned, at left) beside Lucrezia Borgia, cast as St Catherine of Alexandria, in Pinturicchio’s 1492 fresco *The Disputation of St Catherine*, Sala dei Santi, Borgia Apartments, Vatican.

Jem himself separately promised d’Aubusson and the Order 150,000 ducats in repayment, and swore to cede any Christian territory his father had conquered, should he ever gain the throne — promises never put to the test. He left Rhodes after only five weeks, on 1 September 1482, for a further thirteen years of exile in France and Rome.

Fabric

What survives

Features › courtyard, staircase, great hall, basement

Two connected sections either side of a vaulted lane, each arranged around an interior courtyard — among the best preserved of the sandstone mansions lining the Street of the Knights.

Exterior & entrance

The two-part complex

Two connected sections either side of a vaulted lane running perpendicular to the Street of the Knights, linked at upper-floor level — characteristic of the larger Hospitaller residences here.

The Renaissance doorway & 1514 inscription

The courtyard is entered through a doorway rebuilt in 1514; an inscription recording the work was still legible on its lintel as late as the early 20th century.

The coat of arms of Jean d’Aussay

The façade carries the carved arms of the Knight credited with supervising the house’s 1481 construction.

Interior

The Hospitaller-style staircase

Rises from the ground-floor entrance to the upper floor, connecting the domestic apartments above to the courtyard and street below.

The Great Hall fireplace

The principal upper-floor room preserves a large fireplace in the Hospitaller style, among the building’s most prominent surviving medieval features.

The basement vaults

Restored with its medieval vaults exposed, now home to a permanent exhibition on the house’s own restoration, viewed in part through glass floor panels over excavated remains.

History

Persons & events

1481–1522 › a house, a hostage, a fortune

A private residence whose entire historical weight rests on five weeks in the summer of 1482, and on the thirteen-year diplomatic afterlife that followed.

Jean d’Aussay, Knight Hospitaller

Supervised the house’s construction works in 1481; his coat of arms is built into its façade.

Jem Sultan, Ottoman prince

Lodged in the house for around five weeks in 1482 after fleeing to Rhodes following his defeat by his brother, Sultan Bayezid II.

Pierre d’Aubusson, Grand Master 1476–1503

Invited Jem to Rhodes and negotiated the Order’s custody of him with Bayezid II; later created a cardinal in connection with Jem’s transfer to papal custody.

Guy de Blanchefort, d’Aubusson’s nephew

Commanded the galley that carried Jem from Rhodes to France in September 1482, and later supervised his custody at Bourganeuf.

Sultan Bayezid II

Jem’s elder brother and rival for the Ottoman throne; paid the Order, and later the Papacy, an annual sum for his continued custody in Christian hands.

1912 – today

Reconstructed again under Italian administration after 19th-century damage; restored as a Greek state archaeological monument after 1947/48.

Testimony

A Disputed End

1481–1495 › in contemporaries’ own words, and in dispute

Caoursin’s case for Jem’s value, 1481

The Order’s own Chancellor argued that Jem, “kept secure and well but firmly confined,” was a permanent check on Bayezid, who would not dare attack Christian territory — above all Rhodes — so long as his brother remained alive and available as a rival claimant in enemy hands.

Guillaume Caoursin, Vice-Chancellor of the Order, writing in 1481, as reported in this project’s consulted literature.

A mother of three names

This project’s own sources name Jem’s mother, inconsistently, as “Helena Palaiologos,” as “Çiçek Hatun,” and as a Hungarian-born captive named Sonia. Kenneth Setton, the most rigorous source consulted, is markedly more cautious, describing her only as “said to have been a Slavic princess.”

This document follows Setton’s caution and adopts none of the more specific claims as established fact.

Death at Capua, 1495 — poison, or pneumonia?

One tradition describes a poisoned shaving blade carried from Istanbul; the historian Ivan Cloulas instead reads Jem’s recorded symptoms as more consistent with pneumonia, or simply the poor health of a decade-long captive far from home — a reading this document’s narrative follows with due caution.

Compare this project’s heritage-narrative material with Ivan Cloulas (via Setton) and Halil İnalcık’s study of the Innocent VIII–Bayezid II negotiations.

Successor

The Successor

1481–1522 › the story as this project’s heritage-interpretation tells it

Alongside the critical, source-by-source treatment above, this project also carries Jem’s story in its fuller, traditional telling — as a piece of living heritage interpretation in its own right, not as settled history.

The Successor

Cem is the third son of Sultan Mehmed II, by a mother later sources name variously — most often as Helena Palaiologos. When the Sultan dies in May 1481, the Grand Vizier sends messengers racing to summon his two surviving sons, Cem and Bayezid, to the capital. The messenger sent to Cem simply disappears. Bayezid reaches Istanbul first, on 21 May 1481, and is declared Sultan. Invited by Grand Master Pierre d’Aubusson, Cem sails for Rhodes. He wants to leave again after only a short time — but Sultan Bayezid speaks the language of money, and for 45,000 ducats a year (a gold ducat then weighed about 3.2 grams, worth roughly €500 in today’s market) Cem is kept in Rhodes instead. The Hospitaller Jean d’Aussay supervises the construction of the “House of Prince Cem.” For thirteen years, Bayezid pays the Hospitallers to keep his brother away from the Ottoman throne: with Cem safely in Christian hands, an Ottoman invasion of Rhodes is out of the question. Only on his death do the Ottomans finally start to move.

As retold in this project’s own heritage-interpretation materials, synthesising the 1481 succession crisis and the Order’s thirteen-year custody of Jem; compare the critical, source-by-source treatment above.

Turkish Playboy

Cem now lives in grand style, a celebrity captive with his own Turkish entourage — first in Rhodes, then in France and Italy. He sails for France on 1 September 1482. In Nice, he goes to balls and meets beautiful women, and composes a couplet of his own:
“What a wonderful place
is this city of Nice —
a man who stays there
can do as he please!”
Cem then spends five years at Bourganeuf, in the Limousin, the Aubusson family’s own ancestral country, under the supervision of Guy de Blanchefort, d’Aubusson’s nephew — held in a prison-like, thick-walled tower that still stands there today. Bayezid, in turn, pays Pope Innocent VIII to keep Cem in Rome, a sum said to equal all the Papacy’s other annual revenues combined. Did Cem ever meet Lucrezia Borgia in Rome? Pinturicchio’s 1494 fresco, showing a turbaned figure identified with Cem alongside Lucrezia, keeps the question alive.

As retold in this project’s own heritage-interpretation materials; the Pinturicchio identification is traditional rather than certain.

Poison

Cem is thirty-six when he dies at Capua on 25 February 1495. Sultan Bayezid’s own gatekeeper is said to have travelled from Istanbul to Capua carrying a poisoned shaving blade. Bayezid declares three days of national mourning and asks for his brother’s body — and, by some accounts, keeps trying to bargain the price of the corpse down in gold even afterwards. Cem’s remains do not reach Bursa for another four years. In 1522, Cem’s eldest son Murad and his two grandsons are brought to Rhodes before Sultan Suleiman. Their fate, too, is sealed.

As retold in this project’s own heritage-interpretation materials; compare the critical treatment of Jem’s death above, including Ivan Cloulas’s alternative reading of pneumonia rather than poison.

Gallery

Photo gallery

Eighteen views › from the courtyard to the Roman fresco tradition

Assessment

Significance criteria

Nine-criteria framework › International importance

Rarity

Surviving Hospitaller-period domestic residences of this scale and completeness are comparatively rare in the Medieval Town; the house is identified as among the best preserved sandstone mansions on the Street of the Knights.

High

Representativeness

Representative of high-status Hospitaller residential architecture in the Collachium, and of the specific historical practice of housing eminent political refugees and hostages within the Order’s own quarter.

High

Aesthetic value

A Renaissance entrance doorway, Hospitaller-style staircase and great-hall fireplace give it real architectural interest, though modest relative to this project’s grander monuments.

Moderate–High

Integrity

Substantially altered by at least two major reconstructions (1514, and again under Italian administration) and by modern conservation works; how much fabric Jem himself would have recognised in 1482 cannot be confidently assessed.

Moderate

Historical value

Rests overwhelmingly on its association with Prince Jem’s five-week residence in 1482 — an episode with far-reaching consequences for Hospitaller-Ottoman relations and European crusade diplomacy for a decade after.

Exceptional

Symbolic & social value

As the lodging of a defeated Ottoman prince granted asylum, at a price, by an Order that had itself withstood an Ottoman siege two years earlier, the house carries strong symbolic value.

High

Scientific value

Some ongoing value through the excavated remains beneath its glass floor panels and its restoration-history exhibition, though no research programme comparable to the project’s major fortification monuments.

Moderate

Interpretive potential

An intimate domestic monument through which visitors encounter Prince Jem’s thirteen-year odyssey, the Order’s own handling of defectors and hostages, and its own layered restoration history.

Exceptional

Importance level

Rests principally on its unique, exceptionally well-documented association with Prince Jem’s exile, and on its status as a component of the fortified Collachium underpinning the UNESCO property’s Outstanding Universal Value.

International

Statement of significance

“Captivus pretiosus, pax incerta.” (“A precious captive, an uncertain peace.”)

The House of Prince Jem is of outstanding significance as the setting, however brief, for one of the most consequential hostage sagas of late medieval diplomacy. As the sole surviving rival claimant to the Ottoman throne, kept alive and available in Christian hands, Jem Sultan was arguably the single most expensive political captive of the fifteenth century: for as long as he remained in European custody — five weeks at Rhodes in 1482, then thirteen years in France and Rome — he was a formidable check on Sultan Bayezid II, funding first the Order’s own treasury and then the papal court. His death in 1495 removed, at a stroke, the single most formidable weapon available to the West against the Ottoman Empire. This significance must be read together with an honest account of the house’s own integrity: substantially rebuilt in 1514 and again under Italian administration, its surviving fabric cannot be confidently separated into what Jem himself would have known. Notwithstanding these qualifications, the House of Prince Jem remains a monument of international significance: an intimate, well-preserved example of Hospitaller domestic architecture, and a component of the fortified Collachium underpinning the Outstanding Universal Value of the UNESCO-inscribed Medieval City of Rhodes.

National

Protected under Greek Archaeological Law by Ministerial Decision ΥΑ 23084/737 (25 August 1948), ΦΕΚ 10 (23 September 1948), confirmed under Law 3028/2002.

UNESCO

Medieval City of Rhodes (ref. 493), inscribed 1988, criteria (ii), (iv) and (v) — one of the component monuments of the Collachium cited in the property’s Statement of Outstanding Universal Value.

References

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