Sancho III From Wikipedia the free encyclopedia Sancho III may refer to: King Sancho III of Navarre (c. 985 – 1035) King Sancho III of Castile (1134–1158) Sancho III of Gascony Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article.