House of Trastámara
Raymond, fourth son of Count William I of Burgundy, travelled to Castile-León in the late eleventh century and there married Urraca, the future monarch. She was succeeded by their son, Alfonso VII. Subsequent monarchs of Castile and León were their agnatic descendants until the 16th century, although the crown had passed to an illegitimate cadet branch, the House of Trastámara, in the late 14th century.