David Steuart Erskine, 11th Earl of Buchan, styled Lord Cardross between 1747 and 1767, was a Scottish antiquarian.
Background
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 married, on October 15, 1771, his cousin Margaret Fraser (d May 12, 1819), the great-granddaughter of David Erskine, 9th Earl of Buchan.
Education
He studied at Saint Andrews University and Edinburgh University.
Career
He was the brother of Henry Erskine and Lord Erskine. 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 was the Secretary at the British Embassy in Madrid in 1766-1767. 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 whom 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 lieutenant
Feeling incapable of making the choice asked of him he bequeathed the box back to the earl. He also commissioned a cable-stayed bridge over the River Tweed at Dryburgh. He opened this bridge on 1 August 1817 but it collapsed within months.
A replacement was built after a redesign, but this too collapsed in 1838.
A more permanent bridge did not arrive until 1872, when the suspension system was used instead. There is an interesting story concerning the Earl in which the writer George Dyer brought him to meet Charles Lamb at his flat in Mitre Court Buildings.
Membership
Royal Society]
Erskine was elected a member of the American Antiquarian Society in 1816.