John Sinclair of Ulbster (1754-1835) Scottish politician, economist and writer on finance and agriculture, born at Thurso Castle, Caithness, Scotland. Author of Statistical Account of Scotland (21 volumes, 1791-1799). Engraving after the portrait by Henry Raeburn showing Sinclair in Highland dress. From A Biographical Dictionary of Eminent Scotsmen by Thomas Thomson (1870).