peter is listed among the numerous nobles and prelates to have attended the great diet of pentecost in mainz (may 20-22) of 1184, and was almost certainly among the many bishops attending the diet of christ in mainz on march 27, 1188, where his imperial master took the cross, for he himself shortly followed the imperial army to the holy land in 1189 in the company of gutbert, lord of apremont; henry, count of salm; and garsires and regnier of montreuil. while he was to be absent, he named his nephew frederick, dean of toul, and the abbot of saint aprus of toul vicars general of the church of toul. in 1191, he was present at the siege of acre, having arrived in the company of henry ii, count of champagne. after the treaty of jaffa between saladin and richard the lion-heart was signed on september 2, 1192, allowing christians free access to jerusalem, he made his way there, where he died and was buried.