Blasius Mataranga's short-lived principality between the Shkumbin and Seman rivers, carved out in 1358 as the Serbian Empire fell apart — a grain-trading lordship tied to Ragusa, fighting the Thopias and allying with the Balsha in the war of 1363-64.
Collapsed after Blasius's death c.1367; his son Gjon kept a remnant, but by the early 1370s the lands had been absorbed by the Thopia principality and the Muzaka.
The standard scholarly survey of the Balkans in exactly this period — the Albanian principalities, the Serbian collapse and the Ottoman conquest. (Open Library verified)
The polity-specific academic study of medieval coastal Albania — Durres, Berat and the principalities of this record. (Open Library verified)