Sancho Garcés, Lord of Uncastillo

Sancho Garcés (c. 1038 – 6 January 1083) was an illegitimate son of King García Sánchez III of Pamplona and first cousin of King Alfonso VI of León. Lord of Uncastillo and Sangüesa, he was the father of Ramiro Sánchez whose son García Ramírez gave rise to a new dynasty of Navarrese monarchs.

Sancho Garcés was an illegitimate son of King García Sánchez III and a concubine, born around 1038 and before his father married Stephanie. He was appointed tenant-in-chief of Uncastillo and Sangüesa and could have also been the Sancho Garcés who appears governing Ruesta (1058), Surta (1065), Autol (1071), and Anguiano and Tobía in 1073. He had several siblings from his father's legitimate marriage, including King Sancho Garcés IV and Ramiro Garcés. He was also the brother of Mencía Garcés, wife of Fortún Ochoiz, also an illegitimate daughter of the king, although it is not known if Sancho and Mencía shared the same mother.

He died on 6 January 1083 with his brother Ramiro who led the army sent by Alfonso VI in what was to be known as the disaster or the treachery of Rueda, where many other nobles lost their lives, including count Gonzalo Salvadórez.

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