Editing Ottoman Interregnum (section)

===Süleyman enters civil war===
Meanwhile, the other surviving son of Bayezid, [[Musa Çelebi]], who was captured at the [[Battle of Ankara]], was released by [[Timur]] into the custody of Yakub of [[Germiyan]].{{sfn|Kastritsis|2007|p=85}} Musa was freed after Mehmed made a request for his brother's release. Following İsa's death, Süleyman crossed the straits with a large army.{{sfn|Kastritsis|2007|p=110}} Initially, Süleyman was successful. He invaded Anatolia, capturing Bursa (March&nbsp;1404){{sfn|Kastritsis|2007|p=112}} and Ankara later that year.

During the stalemate in Anatolia, which lasted from 1405 to 1410, Mehmed sent Musa across the [[Black Sea]] to [[Thrace]] with a small force to attack Süleyman's territories in south-eastern Europe. The maneuver soon recalled Süleyman to Thrace, where a short but sanguinary contest between him and Musa ensued. At first, Süleyman had the advantage and won the [[Battle of Kosmidion]] in 1410, but in 1411 his army defected to Musa at Edirne. Süleyman was captured, given to Musa's bodyguard, Koyun Musasi, and strangled to death on 17 February 1411.{{sfn|Finkel|2006|p=32}}{{sfn|Kastritsis|2007|pp=155–156}} Musa was now the ruler of the Ottoman dominions in Thrace.