Alfonso of Aragon refers to several historical figures from the Aragonese royal family, most notably Alfonso I, also known as Alfonso the Battler, who reigned from 1104 to 1134. He was a significant figure in the Christian Reconquista, known for his military campaigns against the Moors in Spain. His efforts helped expand the territories of the Kingdom of Aragon. Another notable Alfonso is Alfonso II, who ruled from 1162 to 1196. He was the first king of Aragon to adopt the title of king and played a crucial role in consolidating the kingdom's power. His reign marked the beginning of Aragon's prominence in medieval Spain.