Ernst I.
Ernst I. designates the following persons:
- Ernst I. , Grenzgraf im Nordgau, † 865, see Ernst (Nordgau)
- Ernst I. (Swabia) , Duke (1012-1015)
- Ernst I (Braunschweig-Göttingen) , Duke (1318–1367)
- Ernst I (Braunschweig-Grubenhagen) , Duke of Osterode (1322–1361)
- Ernst I of Baden-Durlach , Margrave (1533), see Ernst (Baden-Durlach)
- Ernst I (Braunschweig-Lüneburg) , Duke (1520–1546)
- Ernst I (Saxe-Gotha-Altenburg) , Duke (1601–1675)
- Ernst I (Hessen-Rheinfels-Rotenburg) , Landgrave (1658–1693)
- Ernst I (Saxe-Coburg and Gotha) , Duke (1784–1844)
- Ernst I (Sachsen-Altenburg) , Duke (1826–1908)
- Ernst I. zu Hohenlohe-Langenburg , non-ruling prince (1794–1860)
