Correspondence and papers, literary manuscripts and journals of Sylvester Douglas, Baron Glenbervie (1744-1823) and of earlier members of the Douglas family, mainly his great-grandfather, Robert Douglas (1625-1716), Bishop of Brechin, 1682-1684, and the last Bishop of Dunblane (1684-1689) in the pre-Revolution episcopal establishment of the Church of Scotland; and his father, John Douglas of Fechil in the parish of Ellon, Aberdeenshire (1714-1762).