Goewin
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In Welsh mythology, Goewin was Math ap 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.
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.
The Winter Prince: