Christian Lord of Oca and brother-in-law of Garcia Ordonez.
Historically son Diego Alvaarez, who succeeded his father at Oca. The historical Alvar Díaz confirmed three of the ten charters issued by Sancho during his seven year rule (1065-1072).
Well pleased were all they who beheld this, save only Alvar Diez and Garcia Ordonez, for they did not love the Cid.