over the principalities of Travunija and Zahumlje. Thus, by 1040 his state stretched in the coastal region from Ston in the north, down to his capital, Skadar, set up along the southern banks of the Skadar Lake, with other courts set up in Trebinje, Kotor and Bar. Wars with Byzantines 1039–42 In 1039, the Byzantine Emperor Michael IV the Paphlagonian was waiting in Thessaloniki for a shipment of 10 kentenars of gold (7,200 gold nomismata) coming from his provinces in Southern Italy, but the cargo ship (galley) was wrecked off the Doclean coast due to stormy weather in the winter and the goods were taken by Vojislav, who refused to return it upon Michael's requests. The emperor, who had already retaken Dyrrhachium, became furious and sent general George Probatas to tackle Vojislav, but the Byzantine army, unfamiliar with the terrain, was ambushed in the gorges and totally defeated. Vojislav's son, Radoslav, is noted as having killed a Byzantine military commander on the battlefield. Kekaumenos, a strategos sent for Vojislav, ended up imprisoned by Vojislav and taken to Ston. The 1040-41 Uprising of Peter Delyan, who crowned himself "Czar Peter of the Bulgarians", made another Byzantine incursion against Duklja unlikely as the Byzantines were now occupied by the Bulgarian advance. 1042 In 1042, the new emperor Constantine IX decided to attack Duklja with an army based in Dyrrhachium and the neighbouring themes. The Byzantine army under Michaelus Anastasii was defeated and Vojislav ensured a future for Duklja without imperial authority. The battle took place in the mountainous area between Bar and Crmnica after midnight on October 7, 1042. Prior to the battle a man entered the Byzantine camp and spread false information about a huge enemy army, causing panic among the Byzantines. Stefan Vojislav, along with three of his sons, led the Dukljans into battle. They slowly moved down the hills along with shouting and blowing horns and trumpets so it would exaggerate their appearance. The Byzantines were trapped in the mountainous area, as the Dukljans blocked the passage. They caught the Byzantines unprepared and managed to cause chaos among their ranks and after heavy fighting routed the remaining Byzantine forces. Some historical records claim that two-thirds of the Byzantine army had been killed. Byzantine historian John Skylitzes (1040–1101) claimed that 60,000 Byzantines participated in the battle, but these records are considered inaccurate. Most historians agree that there were about 40,000