Editing Ottoman Interregnum (section)

===İsa and Mehmed===
Civil war broke out among the sons of Sultan [[Bayezid I]] upon his death in 1403. His oldest son, [[Süleyman Çelebi|Süleyman]], with his capital at [[Edirne]], ruled the recently-conquered [[Second Bulgarian Empire]], all of [[Thrace]], [[Macedonia (region)|Macedonia]], and northern [[Greece]]. The second son, [[İsa Çelebi]], established himself as an independent ruler at [[Bursa, Turkey|Bursa]],{{sfn|Kastritsis|2007|p=79}} and Mehmed formed a kingdom at [[Amasya]].{{sfn|Kastritsis|2007|p=73}} War broke out between Mehmed and İsa, and following the Battles of Ermeni-beli{{sfn|Pitcher|1968|p=59}} and of [[Battle of Ulubad|Ulubad]] (March–May 1403),{{sfn|Kastritsis|2007|p=79}} İsa fled to Constantinople, and Mehmed occupied Bursa.{{sfn|Kastritsis|2007|pp=90–91}} The subsequent battle at Karasi between Mehmed and İsa resulted in Mehmed's victory and Isa fleeing to [[Karaman]].{{sfn|Pitcher|1968|p=59}} İsa was later killed in a bath by agents of Mehmed.{{sfn|Kastritsis|2007|pp=109–110}}