| Notes |
- (Research):
BIOGRAPHY
Guillaume was born in Bayeux about 900 (possibly in 893), the son of Rollo, Normandy's first duke, whom he succeeded, and Poppa/Papie of Bayeux. All that is known of Poppa is that she was a Christian, and the daughter of Berengar, comte de Bayeux, the previous lord of what became Normandy. According to Planctus, he was baptised a Christian.
Guillaume succeeded Rollo sometime around 928. It appears that he faced a rebellion early in his reign, from Normans who felt he had become too Frankified. When the Bretons rebelled he subdued them, taking Brittany, the Channel Islands, the Cotentin, and the Averanchin.
The following years are obscure. In 939 Guillaume became involved in a war with Arnulf I of Flanders, which soon became intertwined with the other conflicts of the reign of Louis IV of France. He was killed on 17 December 942 by the followers of Arnulf and Thibaut de Blois, while at a meeting to settle their conflict. His son Richard I of Normandy succeeded him.
- (Medical):Ambushed and killed by followers of Amulff while at a peace conference
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Abt 900 - 942 (~ 42 years)
