Abstract: The papers of Admiral Sir William Sidney Smith contain letters concerning Smith's brother, John Spencer Smith, who was British ambassador to the Porte at Constantinople in the early 1790s. Correspondents include Robert Liston, British Minister to the United States. Also included is a genealogy of the Smith family, a battle order issued by Smith aboard HMS Tigre during the siege at Acre in 1799, and an invitation to the funeral of the Duke of Wellington.