Alfonso VI

As the middle of three sons of King Ferdinand I of León and Sancha of León, Alfonso was allotted León when the kingdom was divided following his father's death, while Castile was given to his elder brother Sancho, Galicia to younger brother García, and sisters Urraca and Elvira given the cities of Zamora and Toro respectively. Each of the brothers was also assigned a sphere of influence among the Taifa states. Alfonso appears to have taken the first step in violating this division, in 1068 invading the Galician client Taifa of Badajoz and extorting tribute. In response, Sancho attacked and defeated Alfonso at Llantada but three years later in 1071 they joined forces against García. Sancho over-marched Alfonso's León to conquer García's northern lands, while Alfonso himself is found issuing charters in the southern part of the Galician realm. García fled to taifa Seville, and the remaining brothers then turned on each other. This conflict culminated in the Battle of Golpejera in early January, 1072. Sancho proved victorious and Alfonso himself was forced to flee to his client Taifa of Toledo. Later that year as Sancho was mopping up the last of the resistance, besieging his sister Urraca at Zamora in October, he was assassinated, opening the way for Alfonso to return to claim Sancho's crown. García, induced to return from exile, was imprisoned by Alfonso for life, leaving Alfonso in uncontested control of the reunited territories of their father. In recognition of this and his role as the preeminent Christian monarch on the peninsula, in 1077 he proclaimed himself "Emperor of all Spain".