Background
He was the son of Ernest I, Duke of Brunswick-Lüneburg. On 12 October 1561 he married Dorothea of Denmark (29 June 1546 Kolding–6 January 1617 Winsen), daughter of Christian III of Denmark and Dorothea of Saxe-Lauenburg.
He was the son of Ernest I, Duke of Brunswick-Lüneburg. On 12 October 1561 he married Dorothea of Denmark (29 June 1546 Kolding–6 January 1617 Winsen), daughter of Christian III of Denmark and Dorothea of Saxe-Lauenburg.
In 1582, William began suffering from fits of insanity. Sophie of Brunswick-Lüneburg (30 October 1563 – 1639). Married George Frederick, Margrave of Brandenburg-Ansbach.
Ernest II, Duke of Brunswick-Lüneburg (31 December 1564 – 2 March 1611).
Prince of Lüneburg from 1592–1611. Elisabeth of Brunswick-Lüneburg (19 October 1565 – 17 July 1621).
Married Frederick, Count of Hohenlohe-Langenburg. Christian, Duke of Brunswick-Lüneburg (19 November 1566 – 8 November 1633).
Prince of Lüneburg from 1611–1633.
Augustus I, Duke of Brunswick-Lüneburg (18 November 1568 – 1 October 1636). Prince of Lüneburg from 1633–1636. Dorothea of Brunswick-Lüneburg (1 January 1570 – 15 August 1649).
Married Charles I, Count Palatine of Zweibrücken-Birkenfeld.
Clara of Brunswick-Lüneburg (16 January 1571 – 18 July 1658). Married William, Count of Schwarzburg-Blankenburg.
Anne Ursula of Brunswick-Lüneburg (22 March 1572 – 5 February 1601)
Margaret of Brunswick-Lüneburg (6 April 1573 – 7 August 1643). Married John Casimir, Duke of Saxe-Coburg.
Frederick IV, Duke of Brunswick-Lüneburg (28 August 1574 – 10 December 1648).
Prince of Lüneburg from 1636–1648. Marie of Brunswick-Lüneburg (21 October 1575 – 8 August 1610)
Magnus of Brunswick-Lüneburg (30 August 1577 – 10 February 1632)
George, Duke of Brunswick-Lüneburg (17 February 1582 – 12 April 1641). Prince of Calenberg 1635–1641
John of Brunswick-Lüneburg (23 June 1583 – 27 November 1628)
Sybille of Brunswick-Lüneburg (3 June 1584 – 5 August 1652).
Married Julius Ernest, Duke of Brunswick-Lüneburg.
