Corpus of Electronic Texts Edition
Cath Maige Tuired: The Second Battle of Mag Tuired (Author: [unknown])

section 7

There were four wizards in those four cities. Morfesa was in Falias; Esras was in Gorias; Uiscias was in Findias; Semias was in Murias. Those are the four poets from whom the Túatha Dé learned occult lore and secret knowledge.