Scottish dating site
The separate primary source references to an individual named Magnus indicate that this suggestion is probably incorrect.From a chronological point of view, Magnuss estimated birth date range as shown above suggests that he was either the son of Gillbride Earl of Angus by a second marriage or that he was the son of Earl Gilchrist.
According to the Complete Peerage, Gillbride Earl of Angus married as his second wife "the heiress of the earls of Caithness", in another passage stating that she was "sister of Harald Ungi Earl of Caithness".The ruler of each province bore the title "Ri", inferior only to the "Ardri" or Supreme King.In the 10th century, the title changed to "Mormaer" or Great Maer or Steward.Balfour Pauls Scots Peerage says that "Magnusis usually designed son of Gillebride Earl of Angus", adding that the "statement was first made by Sir James Dalrymple in his Collections, but he gives no proof".The Complete Peerage says that "it seemsquite probable that [Magnus] was the same person as Malcolm Earl of Angus, son of Duncan, son of Gilchrist, son of Gillbride[who] is named as Earl of Angus and Caithness in 1232 [see above]", although conceding that "the whole matter is, however, very obscure".During the 10th century the province of Argyll was added, and in the 11th century Buchan separated from Mar, while Caithness was conquered by the Norwegians.
The earldom of Dunbar was a further creation of the early 11th century, although it was only called as such from the early 13th century.
A more sensible suggestion is that, assuming Magnuss right to Caithness was inherited from his mother, she was related to the last Earl John, who died in 1232, and whose rights would have been divided between his two heiresses.] .
Balfour Pauls Scots Peerage states that William King of Scotland granted lands of "Purin, Ogguluin and Kinminethen" [Powrie, Ogilvie and Kilmundie] all in Forfarshire to "Gilbert son of the Earl of Angus" by charter dated to [1172/77], and that "from him are descended the Ogilvies of that Ilk, Airlie with its cadets, and Inverquharity" ([1175/85]-1239).
A charter dated 1351 which confirmed the donation of "terram de Kenny" to Aberbrothoc by "Walterum filium Turpini" quotes a document witnessed by "Domino Magno filio Comitis Domino Anegus filio Comitis".
He was apparently installed as Earl of (part) Caithness.
His birth date range is estimated on the assumption that he was the father of his successor, Earl Gillbride/Gibbon/Gilbert (see under the Earls of Caithness, below).