With the newly discovered relic at the head of the army, Bohemond marched out to meet the besieging Muslim force, which was miraculously defeated — as according to the Crusaders, an army of saints had appeared to help them on the battlefield. There was a lengthy dispute over who should control the city. Bohemond and the Italian Normans eventually won, and Bohemond named himself prince. Bohemond was already Prince (allodial lord) of Taranto in Italy, and he desired to continue such independence in his new lordship; thus he did not attempt to receive the title of Duke from the Byzantine Emperor (in whose name he had taken an oath to fight), nor any other title with deep feudal obligations. Meanwhile, an unknown epidemic spread throughout the Crusader camp; Adhemar of Le Puy was one of the victims. Following Bohemond's capture in battle with the Danishmends in 1100, his nephew Tancred became regent. Tancred expanded the borders of the Principality, seizing the cities of Tarsus and Latakia from the Byzantine Empire. However those newly captured cities along with other territory were lost after the Battle of Harran when Baldwin II of Edessa was captured. Bohemond was released in 1103 and went to Italy to raise more troops in 1104, during which time Tancred remained regent of Antioch. Bohemond used the troops he raised to attack the Byzantines in 1107. Bohemond was defeated at Dyrrhachium in 1108 and was forced by Alexius I to sign the Treaty of Devol, making Antioch a vassal state of the Byzantine Empire upon Bohemond's death. Bohemond had promised to return any land that was seized from the Muslims when the Crusaders passed through Constantinople in 1097. Bohemond also fought at Aleppo with Baldwin and Joscelin of the County of Edessa; when Baldwin and Joscelin were captured, Tancred became regent in Edessa as well. Bohemond left Tancred as regent once more and returned to Italy, where he died in 1111. Alexius wanted Tancred to return the Principality in its entirety to Byzantium, but Tancred was supported by the County of Tripoli and the Kingdom of Jerusalem. Tancred, in fact, had been the only Crusade leader who did not swear to return conquered land to Alexius (though none of the other leaders, save for Raymond IV of Toulouse, kept their oaths anyway).