Yakub II

Yaʿḳūb II (died January 1429), also known as Yaʿḳūb Chelebī, was Bey of Germiyan in western Anatolia from 1387 to 1429. Yaʿḳūb was the son of Suleiman Shah and a daughter of Umur. Yaʿḳūb initially supported the Ottoman Sultan Murad I at the Battle of Kosovo, during which Murad was killed, but turned against Murad's successor Bayezid I. Yaʿḳūb attempted to reclaim considerable territory formerly part of Germiyan, including the capital Kütahya, which Suleiman Shah had granted the Ottomans as part of the dowry for his daughter, Devlet Hatun, and Bayezid's marriage. Yaʿḳūb was subsequently jailed by Bayezid in the castle of Ipsala in 1390, when Germiyan wholly came under Ottoman control. 9 years later, Yaʿḳūb managed to escape from prison and sought the protection of Timur, who after crushing Bayezid with the help of Yaʿḳūb at the Battle of Ankara in 1402, restored Germiyan's former boundaries. During the Ottoman Interregnum (1402–1413), Yaʿḳūb allied himself with Mehmed Chelebī against his brothers, as a result of which Germiyan–Karaman relations worsened and Kütahya fell to Mehmed II of Karaman in 1411, interrupting Yaʿḳūb's reign a second time. In 1414, Mehmed Chelebī reinstated Yaʿḳūb as the ruler and defeated the Karamanids. Although Yaʿḳūb initially supported Mustafa Chelebī against Mehmed's son and successor Murad II as the claimant to the Ottoman throne, Mustafa was ultimately defeated, which forced Yaʿḳūb to have amicable relations with Murad II. Yaʿḳūb did not have any male heirs and left the rule to Murad II in his will shortly before he died in 1429.