The Kingdom of Albania was established by Charles of Anjou in the Albanian territories he conquered from the Byzantine Empire in 1271, with the help of the local Albanian nobility. The Kingdom of Albania was declared in late February 1272. The kingdom extended from the region of Durazzo south along the coast to Butrint. A major attempt to advance further in the direction of Constantinople failed at the Siege of Berat (1280–1281). A Byzantine counteroffensive soon ensued, which drove the Angevins out of the interior by 1281. The Sicilian Vespers further weakened the position of Charles, and the Kingdom was soon reduced by the Byzantines to a small area around Durazzo. The Angevins held out here, however, until 1368, when the city was captured by Karl Thopia. In 1392, Karl Thopia's son surrendered the city to the Republic of Venice.