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King of Southern Rheged

c490 Gwrast Lledlwm dies; Rheged given to Merchion Gul
535 Merchion Gul dies; Rheged divided into North, given to Cynfarch Oer, and South

https://en.wikipedia.org/wiki/Meirchion_Gul

Meirchion Gul was probably a late 5th-century king of Rheged, a Brythonic realm in the area of sub-Roman known as the Hen Ogledd .

Next to nothing is known about Meirchion, although his epithet means the Lean. He appears in the Middle Welsh genealogical text Bonedd Gwŷr y Gogledd as the son of the equally obscure Gwrwst Lledlwm, a grandson of Coel Hen, and grandfather of renowned Urien Rheged. He is assumed, like Urien, to have ruled Rheged, including Catterick. His two sons appear at the head of two later dynasties. Cynfarch Oer was Urien's father. Another son, Elidyr Lydanwyn , was the ruler of Rheged, accoriding to the Gwynedd version of Hywel Dda's 'Welsh laws'. He was the father of Llywarch Hen.