Said to be aged 47 at his father's death, Sir Patrick de Dunbar, Knight, Earl of Dunbar, had livery of his father's lands on 14 May 1290. It appears that this Earl of Dunbar assumed the additional alternate title Earl of March, as he appeared designated Comes de Marchia at the parliament at Birgham in 1290,[7] for the purpose of betrothing the Princess Margaret to the son of King Edward I of England. (This failed to come about).
Patrick was one of the "seven earls of Scotland," a distinct body separate from the other estates of the realm, who claimed the right to elect a king in cases of disputed succession.[8] He was one of the Competitors for the Crown of Scotland in 1291, when he entered a formal claim in right of his great-grandmother, Ada, Countess of Dunbar, an illegitimate daughter of William The Lion, King of Scots.[9] Like so many Scottish noblemen, including the Bruces, Dunbar held lands in England also which required knights' services, and he was summoned by King Edward I in 1294 to assist him at war in Gascony.
The Earl of Dunbar and March, with the Earl of Angus, Robert Bruce the elder, and his son the Earl of Carrick, swore fealty to the English King at Wark on 25 March 1296. In this turbulent year he appears to have been betrayed by his wife, who took the Scottish side and retained the castle of Dunbar for Balliol, but was obliged to surrender it to King Edward I of England in April 1296.[9] In 1297 it appears that the Earl ceased his allegiance to Edward I, held his lands of the Scottish Crown, and was favourably received by Sir William Wallace, with whom he had been in bitter battle the previous year.
In 1298 he was King's Lieutenant for Scotland, and in 1300 was present at the siege of Caerlaverock Castle, with his eldest son and heir, Patrick.
^Richardson, Douglas, Magna Carta Ancestry, Baltimore, 2005, pp. 60 & 209, ISBN0806317590 where he is given as the 8th Earl of Dunbar or March
^Anderson, Wiliam, The Scottish Nation, Edinburgh, 1867, vol. iv, p. 74, where he is given as the 8th Earl of Dunbar and his year of death said to be 1309
^Burke, Sir Bernard, Ulster King of Arms, The Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire, London, 1883: 447 – the 1st of de Quincey's 3 wives
^Anderson, Alan O., M.A., Scottish Annals from English Chroniclers, 500 to 1286, London, 1908: 358 – where she is named as Helen
^Burke, Sir Bernard, Ulster King of Arms, The Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire, London, 1883: 606
Miller, James, The History of Dunbar, Dunbar, 1830, pp. 24–34.
Bain, Joseph, Calendar of Documents relating to Scotland, vol.IV, 1357–1509, pps.xx - xxiv, Edinburgh, 1888, for relationships in this Dunbar family refer to the 'Introduction' with other references in the main sections of the volume.
Dunbar, Sir Archibald H., Bt., Scottish Kings, a Revised Chronology of Scottish History, 1005 - 1625, Edinburgh, 1899, pp. 87–93 and 282.
One or more of the preceding sentences incorporates text from a publication now in the public domain: McNeill, Ronald John (1911). "March, Earls of". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 17 (11th ed.). Cambridge University Press. p. 687.
