Dahut

[2][3] Dahut was first mentioned in the third edition of Albert Le Grand's Vie des Saincts de la Bretagne Armorique (1680).

In this early version, the "shameless" Dahut intends to kill her father and steals the key which symbolizes his royalty.

It is debated how much of this story is traditional, with the first known mention of Malgven coming from Édouard Schuré's essay Les Grandes légendes de France in the 1890s.

The doe transformed into the beautiful Ahès, daughter of Gradlon, who gave Mark the ears and the mane of his horse Morvarc'h as punishment.

[9][10] "Ahez" appears in the Breton folktale Kristof, a variant of the fairytale "The Lazy Boy" (Aarne-Thompson type 675) recorded in 1870.

Matthieu Boyd notes the general scholarly consensus that this tale is a literary creation, and interprets Kristof as a Christian figure who ends the pre-Christian society of Ys.

[12] French singer Nolwenn Leroy recorded a song titled "Ahès" on her 2012 album Ô Filles de l'Eau.

As the novel progresses, the destruction of Ys is due in part to Dahut's continued use of sorcery as well as the inaction of King Gradlon and Princess Rozenn.