Of his stature in the Leonese kingdom, Roger Wright claims that he "would probably be now ... widely celebrated ... if he had only had a biographer", like his predecessor, Diego Gelmírez, did.
[1] A native of Galicia, Pedro was probably educated at the University of Paris, where he earned the title of magister.
Letters he later received from Pope Innocent III indicate that he had studied and taught theology at some point.
He negotiated an agreement of confraternity between the cathedral chapters of Salamanca and the neighbouring diocese of Ávila across the border in Castile.
[5] The sources for Pedro's long 33-year tenure of the archdiocese of Santiago are surprisingly meagre.
He secured a steady revenue through the votos de Santiago, regular donations to the Saint James in gratitude for his military assistance.
From Innocent III he got rulings that the dioceses of Évora, Idanha, Lamego and Lisbon were his suffragans, but he had to give up claims on Coimbra and Viseu.