Letter from the Duke of Atholl dated 26 February 1765 announcing the successful conclusion of negotiations with Mr Grenville regarding the sale of sovereignty and customs of the Isle of Man to the Crown. The Duke outlines the financial terms (£70,000 plus an annuity of £2,000 per annum to the Duchess) and confirms retention of landed estates. This is a crucial primary source documenting the moment of agreement that led directly to the Parliamentary Revestment Act of 1765.