In the judgment pronounced in 1527 by the ecclesiastical court against Patrick Hamilton, one of the earliest martyrs to reformation principles in Scotland, his name is appended as George, abbot of Dunfermline.
All the bitter prosecutions that took place in Scotland during this stormy period of history were the result of measures devised by succeeding archbishops of St Andrews and their active and trusted co-adjutor the abbot of Dunfermline.
Cardinal Beaton, in a letter dated 6 July 1545 addressed to Pope Paul III, informs the latter that his prerogative of cardinal had been rudely assailed by the archbishop of Glasgow (Gavin Dunbar), and that he had named Robert Reid, bishop of Orkney, and George, abbot of Dunfermline, to examine witnesses and report to the pope.
When the siege had lasted six months, he proposed that the besieged should be lured into submission by an offer of obtaining absolution from the pope and of being set at liberty on delivering up the castle.
He was present at a convention of lords spiritual and temporal held at Stirling, 18 June 1545, in which both the contending factions in the state were represented, when, by mutual concessions, a basis of agreement was formed.
William Patten, the English chronicler of the "Expedition into Scotland", and an eye-witness of the battle, gives a very minute description of a banner found on the field after the fight, which was said to be that of the abbot of Dunfermline, and under which the "kirkmen" had fought.
When the popular tide had run so far in Scotland that many of the queen-regent's most influential advisers had deserted her, the abbot showed no sign of defection.
In August following the Scottish parliament voted the abolition of the Roman Catholic Church and hierarchy in Scotland, and sent Sir James Sandilands to France to obtain the ratification of this measure by the queen.
Holinshed says: "The queen, being desirous to have peaceful landing in Scotland, would not for the present meddle with religion, although Durie, abbot of Dunfermline, and John Sinclaire, lately appointed bishop of Brechin, did vehemently persuade and labour her to the contrary".
They appear to have acted as guardians to two younger ones, George and John, who were sent when young to the Scots college at Paris, and subsequently to the Catholic University of Leuven.