Ernest I, Duke of Brunswick-Grubenhagen
|Ernest I of Brunswick-Grubenhagen|
|Spouse(s)||Adelheid of Everstein-Polle|
|Noble family||House of Guelph|
|Father||Henry I, Duke of Brunswick-Grubenhagen|
|Mother||Countess Agnes of Meissen|
|Died||9 March 1361|
He was the son of Henry I, the Admirable and his wife Agnes, née Countess of Meissen. Henry the Admirable founded the Principality of Grubenhagen in 1291, after the Guelph princes had divided their inheritance. Ernest originally intended to follow a spiritual career, but after his father's death, he and his brothers Henry II and William jointly ruled the principality.
Grubenhagen was rather smaller than the other Guelph principalities. Because Henry the Admirable had many children (eight sons and eight daughters), it was this difficult to supply all the descendants in style. His eldest son Henry II could therefore not take the undivided sovereignty over the principality. In 1324, Henry concluded an extensive pact with his brothers Ernest and William under which the territory should be governed jointly. Shortly afterwards, however, the principality was divided. Ernest received the area around Einbeck, Grubenhagen Castle and Osterode. The towns of Duderstadt, Osterode and Einbeck were ruled jointly. In 1359 he made his son Albert I co-regent. His older brother Henry died 1351 and his sons lingered broad and died without issue, so after the death of his childless younger brother William in 1360, Ernest ruled the entire principality of Grubenhagen. After his death, on 9 March 1361, he was succeeded by his son Albert I.
Marriage and issue 
Ernst married in June 1335 Adelheid of Everstein-Polle (died after 29 September 1373), daughter of Count Henry II of Eberstein. The marriage produced nine children.
- Otto (born 1337, died young)
- Albert I (born: circa 1339; died 1383)
- married in 1372 Agnes of Brunswick (d. 1410), daughter of Duke Magnus II of Brunswick.
- John II (d. 1401), canon in Hildesheim, Einbeck and Mainz.
- Adelheid (born: circa 1341; died 1406)
- married (circa 1362) Duke Bogislaw V of Pomerania (born: circa 1326; died 1374)
- Agnes (born: circa 1342; died 1394)
- married in 1362 Count Ulrich of Hohnstein
- Anna (born: circa 1343; died 1409)
- married in 1362 Count Henry VIII of Hohnstein
- Ernest (born: circa 1346; died 1400/02), abbot of Corvey (1369–1371)
- Frederick (born: circa 1350; died 1421)
- married Adelheid of Anhalt
- Anna (born: circa 1360; died 1437), Abbess in Osterode
|Ancestors of Ernest I, Duke of Brunswick-Grubenhagen|
- Ludwig Ferdinand Spehr (1877), "Ernst der Aeltere, Herzog von Braunschweig-Grubenhagen", Allgemeine Deutsche Biographie (ADB) (in German) 6, Leipzig: Duncker & Humblot, pp. 257–258
- Paul Zimmermann: Das Haus Braunschweig-Grubenhagen. Wolfenbüttel, 1911
- This article incorporates information from the German Wikipedia.
Ernest I, Duke of Brunswick-GrubenhagenBorn: 1297 Died: 9 March 1361
Henry I, the Admirable
|Duke of Brunswick-Lüneburg
Prince of Grubenhagen