Peter was a chaplain of Queen Urraca (capellanus regine) before he was raised to the see of Lugo after the resignation of his ineffective predecessor, Peter II, in 1113.
According to the suggestions of the Historia compostellana, Peter III remained closely attached to the queen even after his elevation.
He reorganised the chapter of the cathedral of Lugo and began construction on a new building.
He was active in acquiring land for his diocese, as well as Papal privileges in 1123 and 1131.
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