Andrew II, who had pledged to lead a crusade to the Holy Land, petitioned Pope Innocent in 1214 to lift bishops Peter and Kalán Bár-Kalán from being obligated to attend the Fourth Council of the Lateran in the next year, because they were planning to participate in the campaign. However Andrew had again postponed the crusade. Instead, Bishop Peter visited Constantinople and negotiated with Henry of Flanders in mid-1215 over the proposed marriage between Andrew II and Yolanda, the daughter of the Emperor's brother-in-law, Peter II of Courtenay. After the conclusion of the agreement, Peter brought the queen to Hungary across the Balkans. Andrew and Yolanda were married still in that year. In July 1216, the newly elected Pope Honorius III once again called upon Andrew to fulfill his father's vow to lead a crusade. Amid the preparations for war, Peter procured Andrew II to confirm all possessions and privileges of his diocese's collegiate chapter of Vasvár. According to a royal charter from 1224, he was also granted the village of Szovát in Győr County (present-day Bágyogszovát). In May 1217, Andrew's army began its journey to the Holy Land with the participation of Thomas, Bishop-elect of Eger and Peter of Győr. In July, they departed from Zagreb and embarked in Split two months later. The ships transported them to Acre, where they landed in October. Andrew and his army participated in the fruitless clashes at the Mount Tabor against the Ayyubids. When Andrew decided to return home at the very beginning of 1218, Thomas and Peter remained in Syria. Peter died there sometime in 1217 or 1218. According to István Erőss, he was killed in the skirmishes at the Anti-Lebanon Mountains. The Cronica Reinhardsbrunnensis narrated that two unnamed Hungarian bishops were perished during the Siege of Damietta. Historian Gyula Pauler identified them with Peter of Győr and Simon of Várad.