William I, Duke of Bavaria dating history

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Duke William of Bavaria, Count For Hainault, Holland and Zeeland. He was, truly, young and tall, strong and swarthy and agile, more fleet and dexterous than any man in his land, and he had married the daughter of the worthy and valiant Duke of Lancaster; but he was curiously distant and inscrutable: he wouldn't welcome or acknowledge people in the manner of a great prince, and took no pleasure in the company of ladies or damsels, at feasts or otherwise; nor did he have any close confidants (except just one, called master Thierry); and you could never be quite sure whether you were in favor with him or not. And in the end, not long after he'd arranged the peace between the Count of Flanders and the Duke of Brabant, he lost his wits entirely, and most of the time he had to be bound hand and foot. From that point on, the two lands of Hainault and Holland were governed by the lady his wife, and subsequently, since she never had a child by him, by his younger brother Duke Albert.