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John William III, Duke of Saxe-Eisenach (17 October 1666 – 14 January 1729), was a duke of Saxe-Eisenach, and came from the Ernestine line of the House of Wettin.

Amalia van Nassau-Dietz (Den Haag, 25 november 1655 - Allstedt, 16 februari 1695) was de dochter van Willem Frederik van Nassau-Dietz en Albertine Agnes van Nassau.

Op 9 januari 1656 werd zij gedoopt in de Kloosterkerk aan het Lange Voorhout in Den Haag.

Amalia trouwde op 28 september 1690 op het Landgoed Oranjewoud van haar moeder met hertog Johan Willem III van Saksen-Eisenach (1666-1729). Op hetzelfde landgoed beviel Amalia een jaar later van hun enige kind, Willem Hendrik van Saksen-Eisenach (1691-1741), die zijn vader zou opvolgens als vorst van Saksen-Eisenach. Toen Amalia van Nassau-Dietz overleed te Allstedt in Saksen, was zij slechts negenendertig jaar oud. Na haar dood zou hertog Johan Willem nog drie maal hertrouwen.

Christine Juliane of Baden-Durlach (12 September 1678 – 10 July 1707), was a German noblewoman of the House of Zähringen and by marriage Duchess of Saxe-Eisenach.

Magdalene Sibylle of Saxe-Weissenfels (3 September 1673 – 28 November 1726), was a German noblewoman member of the House of Wettin (Albertine line) and by marriage Duchess of Saxe-Eisenach.

Born in Halle, she was the oldest daughter and first child of Duke Johann Adolf I of Saxe-Weissenfels and his wife Johanna Magdalena, the daughter of Duke Frederick William II of Saxe-Altenburg. She was named after her paternal great-grandmother, Duchess Magdalene Sibylle of Prussia.

Marie Christine Felizitas of Leiningen-Dagsburg-Falkenburg-Heidesheim (29 December 1692 – 3 June 1734), was a German noblewoman member of the House of Leiningen and by her two marriages Princess of Baden-Durlach and Duchess of Saxe-Eisenach.

Born in Broich Castle, Mülheim an der Ruhr, she was the fourth from seven children of Johann Karl August, Count of Leiningen-Dagsburg-Falkenburg-Heidesheim and Lord of Broich and Bürgel by his wife Countess Johanna Magdalene of Hanau-Lichtenberg. From Marie Christine's six older and younger siblings, only three survive adulthood: one sister, Sophie Magdalene (by marriage Countess of Salm-Grumbach) and two brothers, Christian Karl Reinhard and Johann Wilhelm Ludwig.