Below is a 3nd "route" or path from Sir Roger Kirkpatrick through Alfred The Great, First King of England, all the way to Cerdic, King of Wessex (c470-c534).
"Cerdic is allegedly an ancestor to Egbert of Wessex, and therefore would be an ancestor of not only the modern British monarchy under Elizabeth II, allowing the British Royal Family to trace its roots back over 1500 years, but virtually every royal lineage in Europe." (per Wikipedia).
Each and every verifying page on Wikipedia has been linked to the person's name, so there should be NO challenges. The "youngest," or most recent of the ancestors were provided by Mr. William Supernaw Ford.
*ROBERT de Brus, son of WILLIAM Brus & his wife --- (-1245). The manuscript history of the Bruce family of Carleton records that “Robertus Brus secundus” succeeded “Willielmus Brus”. He succeeded his Father as Lord of Annandale. “Robertus de Brus” confirmed donations to Gysburn Priory by “Robertus de Brus avus meus…Willielmus pater meus” by undated charter witnessed by “Willielmo de Brus, Johanne de Brus…”.
m ISABEL of Huntingdon, daughter of DAVID of Scotland Earl of Huntingdon & his wife Matilda of Cheshire (1206-1251, bur Saltre Abbey, near Stilton, Gloucs). The Annales Londonienses name "Margaretam, Isabellam, Matildam, et Aldam" as the four daughters of "comiti David", recording the marriage of "la secounde fille Davi" and "sire Robert de Brus". She was granted the manors of Writtle and Hatfield, Essex, 16 Oct 1241 in return for her share of the inheritance of her brother John Earl of Chester.
Sir Robert & his wife had two children:
** These articles do not cite any references or sources.