Sancho Ramírez (c. 1042 – 4 June 1094) was King of Aragon (1063–1094, not formally until 1076) and King of Navarre (from 1076, as Sancho V). He was the son of Ramiro I of Aragon and Ermesinda of Bigorre, and he succeeded his father in 1063.Between 1067 and 1068, the War of the Three Sanchos involved him in a conflict with his first cousins, both also named Sancho: Sancho IV the king of Navarre and Sancho II the king of Castile, respectively.