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*Sancho II* (1036/1038 – 7 October 1072), called *the Strong*, or in Spanish, *el Fuerte*, was King of Castile
 (1065–1072) and León
(1072).
He was the eldest son of Ferdinand I of Castile and Sancha of León
, the eventual heiress to the Leonese crown. He was married to Alberta, a woman, probably foreign, of unknown origin.
He succeeded in Castile
 while his younger brother Alfonso succeeded in their mother's inheritance of León and Galicia
was given to the youngest son García
.
Political situation in the Northern Iberian Peninsula
around 1065:  Garcia II
´s domains(Galicia)  Badajoz, owing tribute to Garcia  Seville, owing tribute to Garcia  Alfonso VI
´s domains (León)  Toledo, owing tribute to Alfonso  Sancho II´s domains (Castile)  Zaragoza, owing tribute to Sancho
In1068, Sancho defeated his cousinsSancho IV of Navarre
 and Sancho of Aragón
 in the War of the Three Sanchos
. He reconquered Bureba
, Alta Rioja
, andÁlava
, which his father had given to Sanchoof Navarre's father, García
, in return for aid against Bermudo III of León
. In that year, he defeated Alfonso
, his brother, at Llantada
, but he soon teamed up with him to conquer Galicia. Theysucceeded (1071) and partitioned it, but Sancho then turned on Alfonso. With the aid of his "alférez
" El Cid
, he defeated Alfonso at Golpejera
 (1072). He then forced him into exile in Toledo and took over León as king.
Some Leonese resistance still persisted, and his sister, Urraca
, Lady of Zamora
, held that city against his rule. He had surrounded the city and begun a siege, when aZamoran noble, named Vellido Dolfos, assassinated Sancho on 6 October 1072. Vellido had gained entry to Sancho's camp pretending to be a deserter, and sought a private conference with Sancho to tell himthe weakness of the Zamoran defence. Once before Sancho, however, he used the king's own sword to impale him in the back. Fleeing, he was chased back to Zamora by El Cid
 but escaped into...