Goewin
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Goewin is a figure in Welsh mythology.
Math fab Mathonwy's foot-holder, she was raped by Gilfaethwy. Learning that she was no longer a virgin, Math punished Gilfaethwy and his accomplice Gwydion, and married Goewin himself.
[edit] Fiction
In the novel, The Winter Prince by Elizabeth Wein, Goewin appears as the daughter of King Arthur and Guinevere, twin sister to Lleu, their son.