	In the succeeding years, he himself came into conflict with the powerful Matthias I, Duke of Lorraine, who sought to gain the rents of the church of Toul for his son, Theoderic, Bishop of Metz; Peter appealed the case to Alexander III, but the Pope was unable to intervene due to his ongoing struggle with Barbarossa. Nevertheless, on the death of the Count of Toul without issue, Peter entrusted the lordship of the county to Matthias's youngest son (also named Matthias). Thereafter, he busied himself with founding several monastic communities, at Liverdun in 1184, at Rinel in 1185, and at Commercy in 1186.