Senyllt ap Dingat
Senyllt ap Dingat was a Brythonic ruler in the 6th century. He was the last ruler of the Kingdom of Galwyddel until being forced out by the Kingdom of Rheged. He fled to the Isle of Man where he established the Kingdom of Ynys Manau.
He is believed to have been born c.530 AD, the son of Galwyddel ruler Dingat ap Tudwal and believed to have been succeeded by his son Neithon ap Senyllt in Ynys Manau as is noted in the Harleian genealogies.