David Erskine, 11th Earl of Buchan

David Steuart Erskine, 11th Earl of Buchan (12 June 1742 – 19 April 1829), styled Lord Cardross between 1747 and 1767, was a Scottish antiquarian and patron of the arts and sciences.

Erskine was the second but eldest surviving son of Henry Erskine, 10th Earl of Buchan, by Agnes, daughter of Sir James Steuart, 7th Baronet. He was the brother of Henry Erskine and Lord Erskine. He studied at St. Andrews University and Edinburgh University. He married, on Oct. 15, 1771, his cousin Margaret Fraser (d. May 12, 1819), the great-granddaughter of David Erskine, 9th Earl of Buchan. They had no children.

His pertinacity helped in effecting a change in the method of electing Scottish representative peers, and in 1780 he succeeded in founding the Society of Antiquaries of Scotland. His correspondents included Horace Walpole, and he produced an Essay on the Lives of Fletcher of Saltoun and the Poet Thomson (1792) and other writings. He died at his residence at Dryburgh (near Dryburgh Abbey, in the Scottish Borders) in April 1829, leaving no legitimate children, and the earldom passed to his nephew Henry.

He was the Secretary at the British Embassy in Madrid in 1766–67. He was also the Grand Master of Scottish Freemasons from 1782 to 1784.

He conducted a correspondence with George Washington and sent him a box made from the oak that hid William Wallace after the Battle of Falkirk. The box was designed by the Goldsmith Company of Edinburgh, and the earl requested that Washington, upon his death, pass it on to the man in his country who he believed should merit it best, and upon the same conditions that induced the earl to send it to Washington. In his will Washington thanked the earl for presenting the box to him along with sentiments which accompanied it; feeling incapable of making the choice asked of him he bequeathed the box back to the earl.

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