
The Strong, killed while besieging his sister Zamora.
Compare Sancho II of Castile with another historical figure:
Sancho II conquered the Kingdom of Leon from his brother Alfonso VI, following the division of their father Ferdinand I's realm. He defeated Alfonso at the Battle of Llantada and forced him into exile in Toledo. This conquest united Leon and Castile under Sancho's rule.
Sancho II conquered the Kingdom of Galicia from his brother Garcia II, who was captured and imprisoned. This conquest completed Sancho's unification of the realms of his father, making him the most powerful Christian ruler in Iberia.
Sancho II besieged the city of Zamora, held by his sister Urraca, who had rebelled against him. During the siege, Sancho was assassinated by a Zamoran noble named Vellido Dolfos. His death ended his unification efforts and allowed his brother Alfonso VI to reclaim the throne.
See how Sancho II of Castile stacks up against other historical figures