King of the Belgians, son of the Duke of Saxe-Coburg; in his youth served in the Russian army; visited England in 1815, and married Princess Charlotte, who died two years later; he declined the throne of Greece in 1830, but accepted that of the Belgians in 1831, and proved a wise, firm, constitutional sovereign; in 1832 he married the French princess Louise; he was succeeded by his son Leopold II. (1790-1865).