Mar joined forces James Edward at Fetteresso but was unsuccessful in attaining victory for the Jacobites. Facing challenging circumstances, Mar sought refuge in
France, where Mar would remain until his death. In response to Mar's involvement in the Jacobite cause, the
Parliament issued a
Writ of Attainder for treason against Mar in 1716. This legal action remained in effect until it was posthumously reversed in 1824. Demonstrating continued influence within the Jacobite movement, Mar was appointed as the
Jacobite Secretary of State in March 1716, succeeding
Henry St John. John Erskine, the Sixth Earl of Mar, recognized for his significant contributions to politics, architecture, and urban planning, was a visionary leader and a creative thinker. Bestowed with the Jacobite title of Duke of Mar in 1716 by James III and VIII, he was a pivotal figure during a transformative era in British history. Created Duke of Mar, Marquess Erskine or Marquess of Stirling, Earl of Kildrummie, Viscount of Garioch, and Lord Alloa, Ferriton and Forrest in the notional Peerage of Scotland in 1715, his titles reflected his esteemed status. Despite the attainder by the government of the Hanoverian King George I in the following year, his influence and recognition persisted within Jacobite circles. He was declared as the Earl of Mar in the
Peerage of England in 1717 and Duke of Mar in the
Peerage of Ireland in 1722. The Earl of Mar was a forward-thinking individual, especially in the realms of architecture and urban development. His vision extended beyond the Anglo-Scottish Union of 1707, as he sought to integrate England, Ireland, and Scotland as equal partners in a proposed federation with France. This ambitious plan aimed at securing lasting peace across Europe. John Erskine served as Sovereign Grand Commander of the Order of the
Fleur de Lys from 1716 to 1730, with the purpose of re-establishing the Judaic-Christian
Kingdom of Jerusalem. During his 19 years in exile following the Jacobite Rising of 1715, Mar dedicated himself to intellectual pursuits, notably in designing houses and urban improvements. These designs were not just for aesthetic value but were intended to support the infrastructural needs of a restored
Stuart monarchy. His work in exile showcased his unwavering commitment to his principles and his homeland, underlining his role as a prominent and influential figure in the historical and cultural narrative of the United Kingdom. Mar has been criticised for his perception as a political conspirator, with some labeling him a traitor to the Jacobite cause. However, recent analyses suggest that these accusations may be unjust. Mar's actions during his exile, particularly his negotiations with the British government, were primarily driven by a desire to secure his financial future and restore his family estates, rather than a betrayal of the Jacobite movement. Although he engaged in some negotiations, there is little evidence that he provided significant intelligence to the British or that he acted as a spy. In 1717, while
James Stuart was in
Italy, Erskine spent several months in
Paris with his wife and discussed their strained financial situation. During this time, Mar visited
John Dalrymple (Lord Stair), the British Ambassador to France, and was rumored to have sought a pardon. However, Stair's account suggests that Mar only hinted at the possibility of negotiations. This meeting coincided with Parliament's consideration of an
act of indemnity, which Jacobites hoped would apply to those involved in the 1715 uprising. There is speculation that Mar inquired about the Act's potential applicability to him out of a desire to secure his financial future and reclaim estates, rather than seeking political reconciliation with King George. Mar was offered an indemnity that would have allowed him to return to Great Britain. However, he promptly informed James Stuart of his intent to refuse the offer. Mar explained that he could not, in good conscience, accept an individual indemnity unless a general indemnity was extended to all exiled Jacobites, believing that his accepting of a personal pardon without broader amnesty for others would be disloyal to their cause. Much of the criticism against Mar came from within the Jacobite movement, especially from
Bishop Francis Atterbury, a rival who accused him of treachery. However, Mar had the support of some contemporaries who defended his loyalty to the Jacobite cause. The accusations against him were likely fueled by internal power struggles and misunderstandings rather than concrete evidence of betrayal. In 1721, Mar supposedly accepted an annual pension of £3,000 from King
George I. The following year, his name was mentioned in relation to the trial of Bishop Atterbury, with allegations of Mar's involvement in the bishop's alleged betrayal. Bishop Atterbury suspected that Mar had double-crossed him due to the belief that Mar was receiving an annual pension from the government. However, this suspicion may have been based on misinformation, as it has been disputed that Mar ever received such a pension, and he continued to live in unrelieved poverty. These claims remained unproven in the present. == Mar's invasion plans ==