Senyllt mab Dingat
Senyllt (also ‘Senild’ in English or ‘Seniltus’ in Latin) was the grandson of King Tutgual.
It was during his reign, roughly around AD 550, that the Kings of Galloway were expelled from their mainland territory by the North Rhegedians under King Urien.
The defeated dynasty retreated to the Isle of Man, where it is thought they continued to thrive for generations.