In later life, when, from having less to chronicle, he was not so taken up with this work, Bishop Forbes was an occasional contributor to the _Edinburgh Magazine_, in which he published a number of topographical and antiquarian articles. Several of these, relating to Roslin Chapel, were collected and printed in 1774, under the _nom de plume_ of _Philo-Roskelynsis_. He died at Leith on 18th November 1775 and was buried in the Maltman's Aisle in South Leith parish church. He does not appear to have had any children. The origin of this collection, _The Lyon in Mourning_, probably dates from the author's imprisonment in Stirling Castle or Edinburgh Castle. In the latter place he was brought into contact with some of those who had taken an active share in the cause of Prince Charles, and it was, doubtless, while listening to their narratives that he was inspired with the idea of committing them to writing. Why he called his collection by the name it bears, he nowhere explains. It has been suggested that it was 'in allusion to the woe of Scotland for her exiled race of princes;' the Lyon being the heraldic representative of the nation. Bishop Forbes, in his own mind, no doubt, identified the Scottish nation with the comparatively few Jacobites within the country. But whatever may be said about the title, the Bishop's purpose was, as he declared, to make up 'a Collection of Journals and other papers relative to the important and extraordinary occurrences of life that happened within a certain period of time,' and which, he adds, 'will serve to fix a distinguishing mark upon that period as a most memorable æra to all posterity.... I have,' he proceeds to say, 'a great anxiety to make the Collection as compleat and exact as possible for the instruction of future ages in a piece of history the most remarkable and interesting that ever happened in any age or country.' Nor was it only what particularly concerned that 'certain YOUNG GENTLEMAN' (as they were wont to style the Prince) that Bishop Forbes set himself to gather information, but also whatever could be gleaned about those who followed his fortunes. He was even desirous that every act of kindness performed by the victorious Hanoverians towards their vanquished enemies, should be cherished with the names of the doers, that they with the others 'may be carefully recorded and transmitted to posterity, according to truth and justice.'