Rodrigo Fernández de Castro, called the Bald, was a Castilian nobleman and soldier. One of the founders of the House of Castro, he was the second son of Fernando García de Hita and Tegridia, sister or aunt of Count Rodrigo Martínez and relative of the Ansúrez family. His paternal grandfather may have been García Ordóñez, who died at the battle of Uclés in 1108.

Rodrigo Martínez was a Leonese nobleman, landowner, courtier, military leader, governor, and diplomat, "the most powerful lay figure in the region of the western Tierra de Campos," who "emerges as far and away the most regular visitor to the court of Alfonso VII between 1127 and 1138." He was a member of the Flagínez family, rose to the highest rank in the kingdom and met his end on the battlefield.