When Ceneu died in 444, his eldest sons split the kingdom in two. Mor inherited the throne of the eastern heartland based on the old capital at Caer Eborac and included the districts of Deifr, Elmet, Pennines and The Peak. Gwrast took the western lands (including Salway, Llwyfenydd, Ribble and Mærsea) and called his new kingdom Rheged (a legendary god) with his capital at Caer Lugus. Gwrast was a warlike ruler, and when Mor died in 476, he annexed the Pennines, The Peak and Elmet from Mor’s heir, Einion. Einion’s younger brother, Arthwys, reconquered the Pennines in 478, but Elmet remained lost to Rheged.
Gwrast map Ceneu died in 490... 1