Domnaill Breck, Donald Brecc, - The Speckled, King of Dalraida
Domnal Brecc mac Echdach Buide (His Gaelic name was Domongart) was King of Dal Riata (Dalriada) from about 629 through 642 when he was defeated and killed in battle at Strathcarron by Eugein í, king of Alt Clut (Dumbarton), Strathclyde. 
↑ HRH Prince Michael of Albany, The Forgotten Monarchy of Scotland (Boston: Elements Publishing, 2000), p. 16-17.
↑Mors Domnaill m. Aedo regis Hibernie in fine Ianuari. Postea Domnall Brecc in bello Sraith Cairuin in fine anni in Decembri interfectus est ab Hoan rege Britonum annis .xu. regnauit.Celt : The Annuls of Ulster U642.1 corpus of electronic texts edition
...Cináed son of Alpín son of Eochaid son of Áed Find son of Domangart son of Domnall Brecc son of Eochaid Buide son of Áedán son of Gabrán son of Domangart son of Fergus Mór ... Celt : Genealogies from Rawlinson B 502: 1696 Genelach Ríg n-Alban
Albert F. Schmuhl, The royal line : chart prepared for the New York Stake Genealogical Board, Church of Jesus Christ of Latter-day Saints centennial exhibition, March, 1936 (Salt Lake City: self published, 1929) https://familysearch.org/search/catalog/239856?availability=Family%20History%20Library. Google Books (http://books.google.com : accessed 7 June 2015). Revised 1980. Purports to go back to Adam, "Genealogical lineages shown on the chart may not always be from father to son, especially in the reigning houses of Kings; some ancient connections are based on legends, believed to be true."
It may be possible to confirm family relationships with Domnall Brecc by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: