Francis Otto, Duke of Brunswick-Lüneburg
Francis Otto, Duke of Brunswick- Lüneburg( 1530 – 1559) was the Prince of Lüneburg from 1555 to 1559.
He was the son of Ernest I, Duke of Brunswick- Lüneburg.
Elisabeth of Brunswick-Lüneburg, Duchess of Guelders
Elisabeth of Brunswick- Lüneburg( 11 September 1494 in Celle – 2 April 1572 in Geldern) was a Duchess of Brunswick- Lüneburg by birth and by marriage Duchess of Guelders.
Dorothea of Brunswick-Lüneburg
Dorothea of Brunswick-Lüneburg (1 January 1570 – 15 August 1649) was a daughter of Duke William "the younger" of Brunswick-Lüneburg and his wife, Dorothea of Denmark, Duchess of Brunswick-Lüneburg.
She married Count Palatine Charles I of Zweibrücken-Birkenfeld.
They had four children:
Matilda of Brunswick-Lüneburg
Matilda of Brunswick-Lüneburg  (1276 – 26 April 1318) was a German noblewoman and member of the House of Welf.
By birth, she was a duchess of Brunswick-Lüneburg and by marriage Duchess of Glogów, Ścinawa, etc.
She was the seventh child and only daughter of Albert I, Duke of Brunswick-Lüneburg by his second wife Alessina, daughter of Margrave Boniface II of Montferrat.
Catherine of Brunswick-Lüneburg
Catherine of Brunswick- Lüneburg( 1395 – 28 December 1442, Grimma) was a member of the House of Welf, a princess of Brunswick- Lüneburg and by marriage, the Electress of Saxony.
Elizabeth of Denmark, Duchess of Brunswick-Wolfenbüttel
Elisabeth of Denmark (25 August 1573 – 19 July 1625) was duchess consort of Brunswick-Lüneburg as married to Duke Henry Julius of Brunswick-Lüneburg.
She was regent of Brunswick-Lüneburg in 1616-1622.
Anna of Brunswick-Lüneburg (1502–1568)
Anna of Brunswick- Lüneburg( 6 December 1502 in Celle – 6 November 1568 in Szczecin) was a princess of Brunswick- Lüneburg by births and marriage Duchess of Pomerania.
Albert I, Duke of Brunswick-Lüneburg
Albert the Tall (1236 – 15 August 1279), a member of the House of Welf, was Duke of Brunswick-Lüneburg from 1252 and the first ruler of the newly created Principality of Brunswick-Wolfenbüttel from 1269 until his death.
Margaret of Brunswick-Lüneburg (1442–1512)
Margaret of Brunswick- Lüneburg( 1442 – 8 April 1512 in Wienhausen) was a princess of Brunswick- Lüneburg by birth and by marriage a Duchess of Mecklenburg- Stargard.
Henry the Peaceful, Duke of Brunswick-Lüneburg
Henry the Peaceful( 1411 – 7 December 1473), Duke of Brunswick- Lüneburg, called the Peaceful, ruled over both parts of Brunswick- Lüneburg.

Question: What is the date of death of Matilda Of Brunswick-Lüneburg's father?
Answer: 15 August 1279