When the Roman Empire divided into east and west in 395, the territories of modern Albania became part of the Byzantine Empire. At the end of the 12th century, the Principality of Arbanon was formed which lasted until mid 13th century, after its dissolution it was followed with the creation of the Albanian Kingdom after an alliance between the Albanian noblemen and Angevin dynasty. After a war against the Byzantine empire led the kingdom occasionally decrease in size until the Angevins eventually lost their rule in Albania and led the territory ruled by several different Albanian chieftains until the mid 14th century which for a short period of time were conquered by the short-lived empire of Serbia. After its fall in 1355 several chieftains regained their rule and significantly expanded until the arrival of the Ottomans after the Battle of Savra.