What is "menw"

Menw, son of Three-Cries , is a hero and shapeshifter in early Welsh literature, an "Enchanted Knight" of King Arthur at his court at Celliwig. He appears most prominently in the early Arthurian tale Culhwch and Olwen, in which he is handpicked among Arthur's warriors to accompany Culhwch on his quest to win Olwen. An "Enchanter Knight" of Arthur's court, he learned one of the Three Enchantments from Uther Pendragon. He is ascribed a son named Anynnawg.