to Sirmium and sent his fleet to Zimony after Easter 1167. The Hungarians assembled their troops, and recruited no small number of allied forces as mercenaries, especially Germans, according to Choniates. The contemporaneous Rahewin writes that Stephen III "made war on the emperor of the Greeks" because he had received and assisted his brother, Béla. According to Rahewin and Henry of Mügeln, Stephen received support from his father-in-law, Duke Henry Jasomirgott. However, the Byzantine army led by Andronikos Kontostephanos annihilated the Hungarians, who were under the command of Ispán Denis, in a decisive battle which was fought near Zimony on 8 July. Kinnamos wrote that "the war on the Hungarians" concluded on the battlefield. According to Henry of Mügeln, Stephen signed a peace treaty renouncing the duchy that their father had bequeathed upon his brother, Béla. He also came to terms with Doge Vitale Michiel, giving his niece, Mary, to the Doge's son, Nicholas, on 17 December 1167, according to the early 13th-century History of the Doges of Venice. Later years (1167–1172) There is evidence that suggests that Stephen seized Church revenues to finance his war with the Byzantine Empire. The correspondence of Thomas Becket and John of Salisbury reveals that the principles of the Gregorian Reform were not fully introduced in Hungary "on account of the unbridled acts of tyranny by the seculars against the apostolic institutions" in the late 1160s. Stephen transferred Prodanus, Bishop of Zagreb from his diocese without consulting the Holy See. Pope Alexander III sent his legate Cardinal Manfred to Hungary in 1169, who discussed the debated issues with the king, the queen mother, and the prelates. The negotiations ended with an agreement that prohibited the monarch from arbitrarily deposing or relocating the prelates or confiscating their property. The Pope supported Stephen against Archbishop Lucas of Esztergom when the Archbishop attempted to hinder the consecration of the King's protégé, Andrew, Bishop-elect of Győr, because of his allegedly non-canonical election. The Knights Templar settled in Hungary during Stephen's reign. According to historians Ferenc Makk and Pál Engel, Stephen III granted special privileges to the Walloon settlers of Székesfehérvár, including their exemption of customs duties throughout the kingdom. In the 13th century, the same privileges, the so-called "Székesfehérvár laws", were granted to additional towns, contributing to their development. Stephen died on 4 March 1172. Arnold of Lübeck, who was in Hungary at that time, wrote that a