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In page Mary of Scotland, Countess of Boulogne:

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Matilda finally left the monastery in 1100 to marry King Henry I of England. The marriage was controversial because it was not clear whether the girls had been veiled as nuns. Mary herself had left the abbey in 1096. Matilda wanted her to marry as well, so Henry I arranged a match with Eustace III, Count of Boulogne.[citation needed] The couple had a daughter, Matilda, who succeeded Eustace and later became Queen of England.