Cadet Branches from sons of John George I (1585-1656), Elector of Saxony
Dukes of Saxe-Weissenfels
1657- 1746
to Electorate of Saxony
Augustus (1614 –1680) Duke of Saxe-Weissenfels-Querfurt
- Augustus (1614 –1680) Duke of Saxe-Weissenfels-Querfurt from 1657 and Count of Barby from 1659. Administrator of the Diocese of Magdeburg from 1657, second son of Johann Georg I (1585-1656) Elector of Saxony. Married firstly Anna Maria of Mecklenburg-Schwerin (1627 – 1669) daughter of Adolf Frederick I, Duke of Mecklenburg-Schwerin and secondly Johanna Walpurgis of Leiningen-Westerburg (1647 - 1687) daughter of George William, Count of Leiningen-Westerburg in Schaumburg.
Johann Adolf I (1649 –1697) Duke of Saxe-Weissenfels-Querfurt
- Johann Adolf I (1649 –1697) Duke of Saxe-Weissenfels-Querfurt. Knight of the Order of the Elephant. Married firstly Johanna Magdalena of Saxe-Altenburg (1656 – 1686) daughter of Frederick William II, Duke of Saxe-Altenburg and secondly morganatically Christiane Wilhelmine of Bünau. (1666 – 1707) created Reichsgräfin in 1697, daughter of Rudolf von Bünau.
Johann Georg (1677–1712) Duke of Saxe-Weissenfels-Querfurt
- Johann Georg (1677–1712) Duke of Saxe-Weissenfels-Querfurt. Knight of the Order of the Elephant. Married Fredericka Elisabeth of Saxe-Eisenach (1669 - 1730) daughter of John George I, Duke of Saxe-Eisenach.
Christian (1712–1736) Duke of Saxe-Weissenfels-Querfurt
- Christian (1712–1736) Duke of Saxe-Weissenfels-Querfurt. Knight of the Order of the Elephant. Married Louise Christine of Stolberg-Stolberg-Ortenberg (1675 - 1738) daughter of Christoph Louis I, Count of Stolberg-Stolberg-Ortenberg.
Johann Adolf II (1685- 1746) Duke of Saxe-Weissenfels-Querfurt
- Johann Adolf II (1685- 1746) Duke of Saxe-Weissenfels-Querfurt. Knight of the Garter. Knight of The Order of the White Eagle. Knight of the Military Order of Saint Henry. Married Johannette Antoinette Juliane (1698 – 1726) daughter of John William III, Duke of Saxe-Eisenach.
Dukes of Saxe-Weissenfels-Barby
1680-1739
To Saxe-Weissenfels
Heinrich (1657 -1728) Duke of Saxe-Weissenfels-Barby
- Heinrich (1657 -1728) Duke of Saxe-Weissenfels-Barby, son of Augustus (1614- 1680) Duke of Saxe-Weissenfels-Querfurt. Knight of The Order of the White Eagle. Married Elisabeth Albertine of Anhalt-Dessau (1665 - 1706) daughter of John George II, Prince of Anhalt-Dessau.
Georg Albrecht (1728-1739) Duke of Saxe-Weissenfels-Barby
- Georg Albrecht (1728-1739) Duke of Saxe-Weissenfels-Barby. Knight of The Order of the White Eagle. Married Auguste Louise of Württemberg-Oels (1698 - 1739) divorced in 1732, daughter of Christian Ulrich I, Duke of Württemberg-Oels.
Dukes of Saxe-Weissenfels-Dahme
1711-1715
To Saxe-Weissenfels
Frederick (1673 - 1715) Duke of Saxe-Weissenfels-Dahme
- Frederick (1673 - 1715) Duke of Saxe-Weissenfels-Dahme, youngest son of Augustus (1614 –1680) Duke of Saxe-Weissenfels-Querfurt. Married Emilie Agnes Reuss of Schleiz (1667 - 1729) daughter of Heinrich I, Count Reuss of Schleiz.
Dukes of Saxe-Merseburg
1657- 1738
to Electorate of Saxony
Christian I (1615 – 1691) Duke of Saxe-Merseburg
- Christian I (1615 – 1691) Duke of Saxe-Merseburg, third son of Johann Georg I (1585-1656) Elector of Saxony. Married Princess Christiana of Schleswig-Holstein-Sonderburg-Glücksburg (1634 – 1701) daughter of Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg.
Christian II (1653 – 1694) Duke of Saxe-Merseburg
- Christian II (1653 – 1694) Duke of Saxe-Merseburg. Married Erdmuthe Dorothea of Saxe-Zeitz (1661 – 1720) daughter of Maurice, Duke of Saxe-Zeitz.
- Christian III (1680 – 1694) Duke of Saxe-Merseburg
Maurice Wilhelm (1688 –1731) Duke of Saxe-Merseburg
- Maurice Wilhelm (1688 –1731) Duke of Saxe-Merseburg. Married Henriette Charlotte of Nassau-Idstein (1693 – 1734) daughter of George August, Prince of Nassau-Saarbrücken-Idstein.
Heinrich (1661 – 1738) Duke of Saxe-Merseburg-Spremberg
- Heinrich (1661 – 1738) Duke of Saxe-Merseburg-Spremberg from 1694 later Duke of Saxe-Merseburg. Knight of the Order of the Elephant. Knight of The Order of the White Eagle. Married Elisabeth of Mecklenburg-Güstrow (1668 - 1738) daughter of Gustav Adolph, Duke of Mecklenburg-Güstrow.
Duke of Saxe-Merseburg-Zörbig
1691-1715
To Saxe-Merseburg
August (1655 – 1715) Duke of Saxe-Merseburg-Zörbig
August (1655 – 1715) Duke of Saxe-Merseburg-Zörbig, second son of Christian I (1615 – 1691) Duke of Saxe-Merseburg. Married Hedwig of Mecklenburg-Güstrow (1666 – 1735) daughter of Gustav Adolph, Duke of Mecklenburg-Güstrow.
Duke of Saxe-Merseburg-Lauchstädt
1684-1690
To Saxe-Merseburg
Philipp (1657 – 1690) Duke of Saxe-Merseburg-Lauchstädt
- Philipp (1657 – 1690) Duke of Saxe-Merseburg-Lauchstädt, third son of Christian I (1615 – 1691) Duke of Saxe-Merseburg. Married firstly Eleonore Sophie of Saxe-Weimar (1660 – 1687) daughter of John Ernest II, Duke of Saxe-Weimar and secondly Louise Elisabeth of Württemberg-Oels (1673 –1736) daughter of Christian Ulrich I, Duke of Württemberg-Oels. The Ducal Württemberg-Oels Order of the Skull revived by Louise Elisabeth of Württemberg-Oels, Duchess of Saxe-Merseburg-Lauchstädt, in 1709 as purely an order for ladies.
Duke of Saxe-Merseburg-Spremberg
1694-1731
To Saxe-Merseburg
- Heinrich (1661 – 1738) Duke of Saxe-Merseburg-Spremberg from 1694 later Duke of Saxe-Merseburg. Knight of the Order of the Elephant. Knight of The Order of the White Eagle. Married Elisabeth of Mecklenburg-Güstrow (1668 - 1738) daughter of Gustav Adolph, Duke of Mecklenburg-Güstrow. See above
Dukes of Saxe-Zeitz
1657-1718
to Electorate of Saxony
Maurice (1619 –1681) Duke of Saxe-Zeitz
- Maurice (1619 –1681) Duke of Saxe-Zeitz, fourth son of Johann Georg I (1585-1656) Elector of Saxony. Married firstly Sophie Hedwig of Schleswig-Holstein-Glücksburg (1630 - 1652) daughter of Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg, secondly Dorothea Maria of Saxe-Weimar (1641 – 1675) daughter of William IV, Duke of Saxe-Weimar and thirdly Sophie Elisabeth of Schleswig-Holstein-Sonderburg-Wiesenburg (1653 - 1684) daughter of Philip Louis, Duke of Schleswig-Holstein-Sonderburg-Wiesenburg.
Moritz Wilhelm (1664 – 1718) Duke of Saxe-Zeitz
- Moritz Wilhelm (1664 – 1718) Duke of Saxe-Zeitz. Eldest son of Maurice. Knight of the Order of the Black Eagle. Married Marie Amalie of Brandenburg (1670-1739) daughter of Frederick William, Elector of Brandenburg.
Cardinal Christian August of Saxe-Zeitz (1666- 1725)
- Christian August of Saxe-Zeitz (1666- 1725) Cardinal, Archbishop of Gran and Primate of Hungary. Unable to inherit duchy. Second son of Maurice.
Bishop Maurice Adolf Karl (1702-1759) Duke of Saxe-Zeitz-Pegau-Neustadt
- Maurice Adolf Karl (1702-1759) Duke of Saxe-Zeitz-Pegau-Neustadt (1713-18), Bishop of Hradec Kralove (Königrgrätz) (1732) and Litomerice (Leitmeritz) (1733-52). Maurice Adolf became a priest and renounced to his claims over the duchy. Grandson of Maurice. Knight of The Order of the White Eagle.
Duke of Saxe-Zeitz-Pegau-Neustadt
1699-1718
to Electorate of Saxony
Frederick Heinrich (1668 - 1713) Duke of Saxe-Zeitz-Pegau-Neustadt
- Frederick Heinrich (1668 - 1713) Duke of Saxe-Zeitz-Pegau-Neustadt, third son of Maurice. Married firstly Sophie Angelika of Württemberg-Oels (1677 - 1700) daughter of Christian Ulrich I, Duke of Württemberg-Oels and secondly Anna Fredericka Philippine of Schleswig-Holstein-Sonderburg-Wiesenburg (1665 – 1748) daughter of Philip Louis, Duke of Schleswig-Holstein-Sonderburg-Wiesenburg.
- Maurice Adolf Karl (1702-1759) Duke of Saxe-Zeitz-Pegau-Neustadt (1713-18), Bishop of Hradec Kralove (Königrgrätz) (1732) and Litomerice (Leitmeritz) (1733-52). Maurice Adolf became a priest and renounced to his claims over the duchy. Knight of The Order of the White Eagle. See above