His father allegedly died 100 years before Coel was born. And Coel was father's brother's wife's husband to King Cadwaladr, who died in 664: St. Cadwaladr Fendigaid ap Cadwallon, Brenin Gwynedd
Those of you who were told that you had a Caesar for a 30-somethingth great grandfather may be disappointed.
See http://familypedia.wikia.com/wiki/User:Robin_Patterson/Caesars