Nisien
From Academic Kids
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 Children of Llyr Nissyen plays a role as a counterbalance to his twin. Template:Myth-stub
