Sultan Cem or Cem Sultan (December 22, 1459–February 25, 1495) (; Ottoman Turkish: جم), also referred to as Jem Sultan, or Jem Zizim by the French, was a pretender to the Ottoman throne in the 15th century.
He was a son of Sultan Mehmed II of the Ottoman Empire and Helena Hatun (Princess Helena, daughter of Demetrios Palaiologos).
Cem was the younger half-brother of Sultan Bayezid II of Ottoman Empire and thus a half-uncle of Sultan Selim I of Ottoman Empire.
He was banished to Europe, first under the protection of the Knights Hospitaller of St. John on the island of Rhodes and ultimately that of the Pope.
Read more about Sultan Cem: Succession Dispute, Death