Task: Explanation
Input (English): John (1190 – September 30, 1267), called the Old ("l'Antique"), was a French nobleman, the Count of Auxonne and Chalon-sur-Saône in his own right and regent in right of his son, Hugh III, Count of Burgundy. In contemporary documents, he was sometimes called "Count of Burgundy", as by King William of Germany in 1251. Question: John, was the Count of Auxonne and Chalon-sur-Saône in his own right, was a French nobleman, in contemporary documents, he was sometimes called "Count of Burgundy", in 1251, by which King? Answer: William II of Holland
Output (English):  In contemporary documents, he was sometimes called Count of Burgundy, as by King William of Germany in 1251.