Fernando Yáñez (flourished 1112–1157) was a minor Galician nobleman—a miles, or mere knight—who rose in rank in the service of Queen Urraca (1109–26) and King Alfonso VII (1126–57). He eventually became the royal military commander charged with the defence of the Limia on the border between Galicia and Portugal. Contemporary sources call him the "prince" and "duke" of Limia.