Question: Who is the paternal grandfather of Anna Dorothea, Abbess Of Quedlinburg?

Knowledge 1: Anna Dorothea, Abbess of Quedlinburg
Duchess Anna Dorothea of Saxe-Weimar (12 November 1657 - 24 June 1704) reigned as Princess-Abbess of Quedlinburg from 1684 until her death.Born in Weimar, Duchess Anna Dorothea was the daughter of John Ernest II, Duke of Saxe-Weimar, and Christine Elisabeth of Holstein-Sonderburg.Her father decided she should pursue an ecclesiastical career when she was still a child.From 1681 until 1684, Anna Dorothea was provost of the Quedlinburg monasteries.Upon the death of Princess-Abbess Anna Sophia II, Anna Dorothea was chosen to succeed her, though not without difficulties that required the intervention of the abbey-principality's guardian and fellow Wettin, John George III, Elector of Saxony.The Elector consented to her election on 4 September 1684 and Holy Roman Emperor Leopold I confirmed it on 29 January 1685.In 1698, Frederick Augustus I, who had succeeded to the Electorate of Saxony in 1694 and had been elected King of Poland in 1697, found himself in need of money as the election had cost him a fortune.The King of Poland therefore decided to sell his rights of guardianship of the abbey-principality to Elector Frederick III of Brandenburg.The change was not welcomed by the citizens of Quedlinburg nor by the Princess-Abbess, as it led to diminishing of her power and loss of many of the abbey-principality's possessions.The Princess-Abbess protested against the sale and refused to recognise the Elector of Brandenburg as the abbey-principality's new guardian until military occupation the same year forced her to do so.As many of her predecessors, she often came into conflicts with the Council of the City of Quedlinburg and her guardian.Anna Dorothea suffered poor health in 1703 and went to Carlsbad to recover, but without success.She died the next year.She is buried in Weimar. [SEP] Knowledge 2: John Ernest II, Duke of Saxe-Weimar
John Ernest II (11 September 1627, in Weimar – 15 May 1683, in Weimar), was a duke of Saxe-Weimar.He was the second but eldest surviving son of William, Duke of Saxe-Weimar, and Eleonore Dorothea of Anhalt-Dessau.
Knowledge 1: Anna Dorothea, Abbess of Quedlinburg
Duchess Anna Dorothea of Saxe-Weimar (12 November 1657 - 24 June 1704) reigned as Princess-Abbess of Quedlinburg from 1684 until her death.Born in Weimar, Duchess Anna Dorothea was the daughter of John Ernest II, Duke of Saxe-Weimar, and Christine Elisabeth of Holstein-Sonderburg.Her father decided she should pursue an ecclesiastical career when she was still a child.From 1681 until 1684, Anna Dorothea was provost of the Quedlinburg monasteries.Upon the death of Princess-Abbess Anna Sophia II, Anna Dorothea was chosen to succeed her, though not without difficulties that required the intervention of the abbey-principality's guardian and fellow Wettin, John George III, Elector of Saxony.The Elector consented to her election on 4 September 1684 and Holy Roman Emperor Leopold I confirmed it on 29 January 1685.In 1698, Frederick Augustus I, who had succeeded to the Electorate of Saxony in 1694 and had been elected King of Poland in 1697, found himself in need of money as the election had cost him a fortune.The King of Poland therefore decided to sell his rights of guardianship of the abbey-principality to Elector Frederick III of Brandenburg.The change was not welcomed by the citizens of Quedlinburg nor by the Princess-Abbess, as it led to diminishing of her power and loss of many of the abbey-principality's possessions.The Princess-Abbess protested against the sale and refused to recognise the Elector of Brandenburg as the abbey-principality's new guardian until military occupation the same year forced her to do so.As many of her predecessors, she often came into conflicts with the Council of the City of Quedlinburg and her guardian.Anna Dorothea suffered poor health in 1703 and went to Carlsbad to recover, but without success.She died the next year.She is buried in Weimar. [SEP] Knowledge 2: Anna Dorothea Therbusch
Anna Dorothea Therbusch (born Anna Dorothea Lisiewski, , 23 July 1721 – 9 November 1782) was a prominent Rococo painter born in the Kingdom of Prussia.About 200 of her works survive, and she painted at least eighty-five verified portraits.
Knowledge 1: Anna Dorothea, Abbess of Quedlinburg
Duchess Anna Dorothea of Saxe-Weimar (12 November 1657 - 24 June 1704) reigned as Princess-Abbess of Quedlinburg from 1684 until her death.Born in Weimar, Duchess Anna Dorothea was the daughter of John Ernest II, Duke of Saxe-Weimar, and Christine Elisabeth of Holstein-Sonderburg.Her father decided she should pursue an ecclesiastical career when she was still a child.From 1681 until 1684, Anna Dorothea was provost of the Quedlinburg monasteries.Upon the death of Princess-Abbess Anna Sophia II, Anna Dorothea was chosen to succeed her, though not without difficulties that required the intervention of the abbey-principality's guardian and fellow Wettin, John George III, Elector of Saxony.The Elector consented to her election on 4 September 1684 and Holy Roman Emperor Leopold I confirmed it on 29 January 1685.In 1698, Frederick Augustus I, who had succeeded to the Electorate of Saxony in 1694 and had been elected King of Poland in 1697, found himself in need of money as the election had cost him a fortune.The King of Poland therefore decided to sell his rights of guardianship of the abbey-principality to Elector Frederick III of Brandenburg.The change was not welcomed by the citizens of Quedlinburg nor by the Princess-Abbess, as it led to diminishing of her power and loss of many of the abbey-principality's possessions.The Princess-Abbess protested against the sale and refused to recognise the Elector of Brandenburg as the abbey-principality's new guardian until military occupation the same year forced her to do so.As many of her predecessors, she often came into conflicts with the Council of the City of Quedlinburg and her guardian.Anna Dorothea suffered poor health in 1703 and went to Carlsbad to recover, but without success.She died the next year.She is buried in Weimar. [SEP] Knowledge 2: Anna Amalia, Abbess of Quedlinburg
Princess Anna Amalia of Prussia (9 November 1723 – 30 March 1787) was Princess-Abbess of Quedlinburg.She was one of ten surviving children of King Frederick William I of Prussia and Sophia Dorothea of Hanover.

Answer: William, Duke of Saxe-Weimar