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Cem Sultan or Sultan Cem (December 22, 1459 – February 25, 1495, pronounced [ˈdʒem sulˈtaːn]; Ottoman Turkish: جم سلطان, romanized: Cem sulṭān, Turkish: Cem Sultan, also referred to as Jem Sultan, or Zizim by the French), was a claimant to the Ottoman throne in the 15th century.. Cem was the third son of Sultan Mehmed II and younger half-brother of Sultan Bayezid II, and thus a ...