Diego López I de Haro

Diego López I de Haro was the third Lord of Biscay, and also the ruler of Álava, Buradón, Grañón, Nájera, Haro, and perhaps Guipúzcoa: the most powerful Castilian magnate in the Basque Country and the Rioja during the first quarter of the twelfth century. He was a loyal supporter of Queen Urraca and he fought the invading armies of her estranged husband Alfonso the Battler on two, or perhaps three, occasions.