Ernest I or Ernst I can refer to: Ernest I, Duke of Swabia (reigned 1012–15) Ernest I, Prince of Anhalt-Dessau (died 1516) Ernest I, Duke of Brunswick-Lüneburg (1497–1546), Ernest the Confessor Ernst I, Duke of Saxe-Coburg-Altenburg (1601–1675), Ernest the Pious Ernst I, Duke of Saxe-Coburg and Gotha (1784–1844), father of Prince Albert, the consort of Queen Victoria Ernst I, Prince of Hohenlohe-Langenburg (1794–1860) Ernest Augustus I, Duke of Saxe-Weimar-Eisenach (1688–1748) Ernest Frederick I, Duke of Saxe-Hildburghausen (1681–1724) Ernest Günther I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (1609–1689) Ernst Ludwig I, Duke of Saxe-Meiningen (1672–1724)