==Notes====References==*Bromwich, Rachel, "Trioedd Ynys Prydein: The Triads of the Island of Britain".
* [http://www.allmonarchs.net/uk/other/celtic/strathclyde/rhiderch_hael.html]* Bromwich, Rachel, "Trioedd Ynys Prydein: The Triads of the Island of Britain".