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 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.
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
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.
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.
Hedwig of the Palatinate-Sulzbach
Marie Hedwig Auguste of Sulzbach (born: 15 April 1650 in Sulzbach; died: 23 November 1681 in Hamburg) was a Countess Palatine of Sulzbach by birth and by marriage, Archduchess of Austria and by her second marriage, Duchess of Saxe-Lauenburg.
Anna Maria Franziska of Saxe-Lauenburg
Anna Maria Franziska of Saxe-Lauenburg (13 June 1672 – 15 October 1741) was the legal Duchess of Saxe-Lauenburg in the eyes of the Holy Roman Emperor, the overlord of Saxe-Lauenburg, from 1689 until 1728; however, because her distant cousin George William, Duke of Brunswick-Lüneburg, conquered the duchy by force in 1689, she exercised no control over the territory, instead living in her manors in Bohemia.
She was Grand Duchess of Tuscany as the wife of the last Medici Grand Duke, Gian Gastone.
Anna Maria Franziska was the elder surviving daughter of Julius Franz, Duke of Saxe-Lauenburg, and Maria Hedwig of the Palatinate-Sulzbach.
She married Philipp Wilhelm August of the Palatinate in 1690, with whom she had her only child, Maria Anna, in 1691.
She was widowed in 1693.
Four years later, she married Gian Gastone de' Medici, a Prince of Tuscany.
With her brother-in-law Ferdinando de' Medici's death in 1713, her husband became Tuscany's heir-apparent.
She became Grand Duchess of Tuscany upon the incumbent ruler's death in 1723.
She was Grand Duchess for fourteen years before being widowed again in 1737.
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.
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.

Question: What is the date of birth of Anna Maria Franziska Of Saxe-Lauenburg's mother?
Answer: 15 April 1650