John IV, Duke of Saxe-Lauenburg
John IV of Saxe- Lauenburg( *?– 1414*) was a son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Eric V, Duke of Saxe-Lauenburg
Eric V of Saxe- Lauenburg( died 1436) was a member of the House of Ascania; son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Eric V and his brother John IV jointly succeeded their father in 1412 as dukes of Saxe- Lauenburg.
After John IV had died in 1414, Eric ruled alone.
Magnus I, Duke of Saxe-Lauenburg
Magnus I of Saxe-Lauenburg (1 January 1470 – 1 August 1543) was a Duke of Saxe-Lauenburg from the House of Ascania.
Eric IV, Duke of Saxe-Lauenburg
Eric IV of Saxe- Lauenburg( 1354 – 21 June 1411 or 1412) was a son of Eric II, Duke of Saxe- Lauenburg and Agnes of Holstein.
Christian III of Denmark
Christian III (12 August 1503 – 1 January 1559) reigned as King of Denmark from 1534 and King of Norway from 1537 until his death in 1559.
During his reign, Christian formed close ties between the church and the crown.
He established Lutheranism as the state religion within his realms as part of the Protestant Reformation.
Francis Charles of Saxe-Lauenburg
Francis Charles of Saxe- Lauenburg( born: 2 May 1594; died: 30 November 1660 in Neuhaus) was a prince of Saxe- Lauenburg and a general during the Thirty Years' War.
Clara of Saxe-Lauenburg
Clara of Saxe- Lauenburg( December 13, 1518 – March 27, 1576) was a Princess of Saxe- Lauenburg and Duchess of Brunswick- Gifhorn by marriage.
Bernard II, Duke of Saxe-Lauenburg
Bernard II of Saxe- Lauenburg( ca. 1385/1392–16 July 1463) was a member of the House of Ascania and Duke of Saxe- Lauenburg from 1426 to 1463.
His full title was Duke of Saxony, Angria and Westphalia, however only ruling the branch duchy of Saxe- Lauenburg between 1426 and 1463.
Duke Francis Henry of Saxe-Lauenburg
Francis Henry of Saxe- Lauenburg( born: 9 April 1604; died: 26 November 1658) was a Prince of Saxe- Lauenburg
Dorothea of Saxe-Lauenburg
Dorothea of Saxe-Lauenburg (9 July 1511 – 7 October 1571) was queen consort of Denmark and Norway by marriage to King Christian III of Denmark.
She was known to having wielded influence upon the affairs of state in Denmark.

Question: What is the date of death of Dorothea Of Saxe-Lauenburg's husband?
Answer: 1 January 1559