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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.
After the introduction of the feudal system into Scotland in the 12th century, the earldoms were descendible to heirs general was one of the seven original provinces of Scotland, covering about the same territory as the modern Scottish county of Forfar.
Its ruler was one of the six Mormaers who were described as "comes" in the [1114/15] charter of Scone. The 10th century Pictish Chronicle Cronica de Origine Antiquorum Pictorum records the death of "Dubucan filius Indrechtaig mormair Oengusa, Adalstan filius Advar rig Saxan, et Eochaid filius Alpini" .
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).
It was presumably after , the date of a charter under which Alexander II King of Scotland donated revenue from mills in Invernarn to the bishopric of Moray which was witnessed by "M comite de Anegus et Katania".
Although the name of the witness is given only in abbreviated form, the reference to the county of Angus suggests that it must be Malcolm Earl of Angus who is shown above.
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".The Complete Peerage says that Gillbride seems to have married a daughter of Gospatrick Earl of Dunbar but does not specify the primary source on which this is based --- of Caithness, daughter of ERIK Slagbrellir & his wife Ingigerd Kalisdatter.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".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.