Battle of Ankara
The defeat and capture of sultan Beyazid I by Timur Lenk (Tamerlane) in the Battle of Ankara in 1402 started a period of anarchy in the Ottoman Empire and Mircea took part in the struggles for the Ottoman throne supporting various pretenders. Towards the end of his reign, Mircea signed a treaty with the Ottomans whereby he accepted paying tribute and gave up his claims on Dobruja.