In Madeline L'Engel's "A Wind in the Door" the main character's Mother in Law is named Branwen, after the Irish Princess.
― Anonymous User 4/30/2008
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In the Fantasy book A Swiftly Tilting Planet (third in the Wrinkle in Time series) by Madeleine L'Engle, Meg's mother in-law's first name is Branwen. Her middle is Zillah, and she goes by Beezie (BZ).