Later on, the Bua settled southwards in the Peloponnese, and a part of them found refuge in Italy in the Arbëreshë migrations that followed the Ottoman conquest of the Balkans.
[4] A branch of the tribe regiments was ennobled in the Holy Roman Empire after its service in the Stratioti, a Balkan mercenary unit.
[5] John VI Kantakouzenos's History written in second half of the 14th century is the first primary source about the Bua tribe.
From that time, they appear in the history of the Despotate of Epirus and the involvement of Gjin Bua Shpata in the region.
The coat of arms granted to him therefore reproduced the alleged arms of the ancient kings of Epirus, enriched by the cross with two stars supposedly granted to the Bua by the Emperor Constantine the Great, who stopped in their castle in Albania when he left Rome to go and found Constantinople.
As such, in historiography the Bua are considered to have been among the rulers of the Despotate of Arta and the regions of Aetolia and Acarnania to the south after the Battle of Achelous until 1416.
In 1423, they appear in Venetian records in the Morea under the leadership of Rossus Bua, capu unius comitive Albanensium.