Jaun Zuria (the White Lord): supposedly born from the union of god Sugaar and a Scottish (or Irish, or Danish, or Frankish) princess in the village of Mundaka.
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Alfonso VI of León and Castile entrusted the tenencia to Diego López I de Haro after the death of count García Ordóñez and the first of the lords of Biscay to attach the name of this town to his patronymic was Diego's son, Lope Díaz I de Haro.
Since 1379, when John I of Castile became the Lord of Biscay, the lordship got integrated into the Crown of Castile, and eventually the Kingdom of Spain.