Ernest III, Duke of Brunswick-Grubenhagen
| Ernest III, Duke of Brunswick-Grubenhagen | |
|---|---|
Ernest III, by Cranach, Museum of Fine Arts, Reims | |
| Born | 17 December 1518 Osterode am Harz |
| Died | 2 April 1567 (aged 48) Herzberg am Harz |
| Spouse | Princess Margaret of Pomerania-Wolgast |
| Issue | Elisabeth |
| House | House of Guelph |
| Father | Philip I, Duke of Brunswick-Grubenhagen |
| Mother | Countess Catherine of Mansfeld-Vorderort |
Ernest III of Brunswick-Grubenhagen-Herzberg (by a different counting: Ernest IV; 17 December 1518 in Osterode am Harz – 2 April 1567 in Herzberg Castle, Herzberg am Harz), was a member of the noble family of Guelph and a duke of Brunswick-Grubenhagen.