Sancho I of Aragon, also known as Sancho I of Aragón, was a medieval king who ruled from 1063 to 1094. He was the son of Ramiro I of Aragon and played a significant role in the early formation of the Kingdom of Aragon. His reign was marked by military campaigns to expand his territory and consolidate power in the region. Sancho I is best known for his efforts to strengthen the Christian presence in the Iberian Peninsula during the Reconquista. He was involved in various battles against the Muslim kingdoms and sought to secure Aragon's borders. His legacy laid the groundwork for future Aragonese rulers.