Page "Ottoman Interregnum" Paragraph 2

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 Mûsa was freed, after Mehmed made a request for his brother's release.

Following Isa's death, Süleyman crossed the straits with a large army.

Initially, Suleyman was successful.

He invaded Anatolia, capturing Bursa ( March 1404 ) and Ankara later that year.