Nisien
In
Welsh mythology,
Nisien was the son of
Penarddun and
Eurosswydd and twin of
Efnisien.
Nisien, also Nissyen, was the opposite of
Efnisien in personality. He was tranquil and generous, while his twin was vindictive and destructive. Nisien died at the hands of enemies who mistook him for
Efnisien. In
Evangeline Walton's
The Children of Llyr, Nissyen plays a role as a counterbalance to his twin.
His name is also (in some print editions of the
Mabinogion) spelled "Nissyen," and his brother's name is also spelled "Evnissyen." For a summary of the story of Nissyen and Evnissyen, read
Branwen,a wikipedia article about
Branwen, The Daughter of Llyr.
