Sancho III of Aragon, also known as Sancho III of Navarre, was a medieval king who ruled from 1150 to 1134. He was a member of the House of Jiménez and played a significant role in the political landscape of the Iberian Peninsula during the 12th century. His reign is noted for the consolidation of power in Aragon and the expansion of its territories. Sancho III was known for his military campaigns against the Moors and his efforts to strengthen the Christian kingdoms in the region. He was also involved in various alliances and marriages that helped to secure his kingdom's position among neighboring realms, including Navarre and Castile.