The Battle of Ulubad was fought sometime between 9 March and early May 1403 at Ulubad between the rival sons of the Ottoman

Sultan Sultan (; ar, سلطان ', ) is a position with several historical meanings. Originally, it was an Arabic abstract noun meaning "strength", "authority", "rulership", derived from the verbal noun ', meaning "authority" or "power". Later, it ...

Bayezid I Bayezid I ( ota, بايزيد اول, tr, I. Bayezid), also known as Bayezid the Thunderbolt ( ota, link=no, یلدیرم بايزيد, tr, Yıldırım Bayezid, link=no; – 8 March 1403) was the Ottoman Sultan from 1389 to 1402. He adopted ...

, Mehmed Çelebi and

İsa Çelebi İsa Çelebi (1380 – 1406) was an Ottoman prince ( tr, şehzade) and a co-ruler of the empire during the Ottoman Interregnum. Background İsa was one of the sons of Beyazid I, the Ottoman sultan. His mother was Devletşah Hatun, the daughter ...

, during the first stages of the civil war known as the

Ottoman Interregnum The Ottoman Interregnum, or the Ottoman Civil War ( 20 July 1402 – 5 July 1413; tr, Fetret Devri, , Interregnum Period), was a civil war in the Ottoman Empire between the sons of Sultan Bayezid I following the defeat of their father at the B ...

. The battle was a major victory for Mehmed, who occupied the Ottoman capital,

Bursa ( grc-gre, Προῦσα, Proûsa, Latin: Prusa, ota, بورسه, Arabic:بورصة) is a city in northwestern Turkey and the administrative center of Bursa Province. The fourth-most populous city in Turkey and second-most populous in the ...

, and became master of the Ottomans'

Anatolia Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The re ...

n domains. İsa fled to

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis (" ...

, while Mehmed proceeded to formally lay claim to the succession of Bayezid by an enthronement ceremony in Bursa, and by having his father's body buried there. By 18 May 1403, however, İsa returned to Anatolia with an army provided by their oldest brother,

Süleyman Çelebi Süleyman Çelebi (also Emir Süleyman; d. 17 February 1411) was an Ottoman prince () and a co-ruler of the Ottoman Empire for several years during the Ottoman Interregnum. There is a tradition of western origin, according to which Suleiman the ...

, ruler of

Rumelia Rumelia ( ota, روم ايلى, Rum İli; tr, Rumeli; el, Ρωμυλία), etymologically "Land of the Names of the Greeks#Romans (Ῥωμαῖοι), Romans", at the time meaning Eastern Orthodox Christians and more specifically Christians f ...

. İsa was again defeated and eventually killed after a series of battles by September.

References

Sources

* * * 1403 in Asia Conflicts in 1403 Ulubad History of Bursa Province 1400s in the Ottoman Empire {{Ottoman-battle-stub