Fiacha Cathmhil is listed as the son of Eochad Riada (the same as Cairpre Riata Conaire), and grand son of Conaire as an ancestor of William, King of Scots by Ralph de Diceto in his Imagines Hlstoriarum; and included by Allan Orr Anderson in his Scottish annals from English chroniclers, A.D. 500 to 1286
Sources
British Antiquity - Sir William Playfair; Vol 7, pp 506-13; London, 1811
The Baronetage of Scotland- Sir Robt Douglas; Vol 1, p 493; 1798
Burke's Peerage;
O'Hart's Irish Pedigrees, Irish and British
- Aft 0190