1219.
Mac Cana (Proinsias): Varia: III. 1. Insula Fortium: Ynys y Kedeirn/Kedyrn.
In Ériu 48 (1997), pp. 273–274.
On the possible connection between W Ynys y Kedeirn/Kedyrn in the story of Branwen uerch Lyr and Lat Insula Fortium in the Navigatio Brendani.

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