 In 1380, John Zenevisi was appointed "sebastocrator" or prefect of Vagenetia near Delvina and in 1386 he became prince.In 1399 Esau, supported by some Albanian clans, marched against his wife's brother-in-law John Zenevisi of Argyrokastron.Now Esau was routed and captured, and much of his land was occupied by Zenevisi.