In 1399 Esau, supported by some Albanian clans, marched against his wife's brother-in-law Gjon Zenebishi of Gjirokastër.
The Principality of Gjirokastër or Argyrokastro (1386–1418) was an Albanian principality created by Gjon Zenebishi in 1386, encompassing the area around Gjirokastër (modern southern Albania).