Glessic

Glessig is listed as the name of a hound in Culhwch and Olwen.

Glessig is the sword wielded by Cyflwch, one of King Arthur's warriors in Culhwch and Olwen.

The court of King Arthur, as described in "Culhwch and Olwen", teems with legendary heroes, bards, queens, and mysterious figures.