Otto III, Duke of Brunswick-Harburg

Otto III, Duke of Brunswick-Lüneburg, Lord of Harburg (20 March 1572 in Harburg – 4 August 1641 in Harburg) was a titular Duke of Brunswick-Lüneburg and ruler of the apanage Brunswick-Harburg.

Otto III, Duke of Brunswick-Harburg
Otto III, Duke of Brunswick-Harburg
Born20 March 1572
Died4 August 1641(1641-08-04) (aged 69)
Noble familyHouse of Guelph
Spouse(s)Hedwig of Brunswick-Wolfenbüttel
FatherOtto II, Duke of Brunswick-Harburg
MotherHedwig of East Frisia


Otto was a son of Duke Otto II of Brunswick-Harburg (1528-1603) from his second marriage, with Hedwig (1535-1616), the daughter of Count Enno II of East Frisia.

After the death of his brother Christopher in 1606, Otto III and his brother William Augustus ruled Harburg jointly. Their joint reign was described as harmonious. In a treaty of 11 January 1630, the brothers renounced their right to succeed in Brunswick-Lüneburg, in favour of Christian, in exchange for Christian paying their debts, which exceeded 150000Taler.[1]

On 14 April 1621 in Wolfenbüttel, Otto III married Hedwig (1580-1657), the daughter of Duke Julius of Brunswick-Wolfenbüttel. This marriage remained childless.


  • August B. Michaelis and Julius Wilhelm Hamberger: Einleitung zu einer volständigen Geschichte der Chur- und Fürstlichen Häuser in Teutschland, vol. 1, Meyer, 1759, p. 121
  • Vaterländisches Archiv für hannoverisch-braunschweigische Geschichte, Herold & Wahlstab, 1835, pp. 129, 401 ff, 422, and 424


  1. ^ Wilhelm Havemann: Geschichte der Lande Braunschweig und Lüneburg, 1855, p. 698 Online
Otto III, Duke of Brunswick-Harburg
Born: 20 March 1572 Died: 4 August 1641
Preceded by Duke of Brunswick-Harburg
Succeeded by