Prolgu rivalled Kell as one of the most holy places in the world. The Ulgo tribe of prehistory were one of the races of men called the 'Godless Ones' - which included the Morindim and Dals amongst others. One of their number, a man called Gorim, was successful in beseeching the father of the Gods - UL - to be their deity. As such, UL christened the tribe the Ulgos, made the Gorim their leader, and extended his protection around the city of Prolgu, at the summit of a mountain. Errand was also renamed by UL as his proper name, Eriond, at the beginning of the King of the Murgos.