Esau de' Buondelmonti, ruler of Epirus Esau de' Buondelmonti (Greek: Ησαύ Μπουοντελμόντ) was the ruler of Ioannina and its surrounding area (central Epirus) from 1385 until his death in 1411, with the Byzantine title of Despot.
Following the successful campaigns during the Ottoman Interregnum, Musa Çelebi, one of the sons of Bayezid I, becomes Sultan with the support of Mircea I of Wallachia.