Princess Marie Frederica of Hesse-Kassel
Princess Marie Frederica Wilhelmina of Hesse-Kassel (6 September 1804 – 1 January 1888) was a Duchess consort of Saxe-Meiningen by marriage to Bernhard II, Duke of Saxe-Meiningen.
She was the daughter of William II, Elector of Hesse and Princess Augusta of Prussia.
Maurice Wilhelm, Duke of Saxe-Merseburg
Maurice Wilhelm, Duke of Saxe-Merseburg (5 February 1688 – 21 April 1731) was a duke of Saxe-Merseburg and member of the House of Wettin.
He was born in Merseburg, the fifth (but second surviving) son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz.
Bernhard II, Duke of Saxe-Meiningen
Bernhard II Erich Freund, Duke of Saxe- Meiningen( 17 December 1800, in Meiningen – 3 December 1882, in Meiningen) was a Duke of Saxe- Meiningen.
Johann Wilhelm, Duke of Saxe-Jena
Johann Wilhelm, Duke of Saxe- Jena( Jena, 28 March 1675 – Jena, 4 November 1690), was a duke of Saxe- Jena.
He was the youngest but sole surviving son of Bernhard II, Duke of Saxe- Jena by his wife Marie Charlotte, daughter of Henry de La Trémoille, 3rd Duke of Thouars, 2nd Duke of La Tremoille, and Prince of Talmond and Taranto.
Princess Augusta of Saxe-Meiningen
Princess Augusta Louise Adelaide Caroline Ida of Saxe-Meiningen (6 August 1843 – 11 November 1919) was the daughter of Bernhard II, Duke of Saxe-Meiningen and his wife Princess Marie Frederica of Hesse-Kassel.
She was the mother of Ernst II, Duke of Saxe-Altenburg.
Ernest II, Duke of Saxe-Gotha-Altenburg
Ernest II, Duke of Saxe-Gotha-Altenburg (Gotha, 30 January 1745 – Gotha, 20 April 1804) was the reigning Duke of Saxe-Gotha-Altenburg from 1772 to 1804.
He was the third but second surviving son of Frederick III, Duke of Saxe-Gotha-Altenburg and Luise Dorothea of Saxe-Meiningen.
The death of his older brother Frederick in 1756 made him the heir to the duchy of Saxe-Gotha-Altenburg.
Charlotte Marie of Saxe-Jena
Charlotte Marie of Saxe- Jena( 20 December 1669 in Jena – 6 January 1703 in Gräfentonna), was a German princess member of the House of Wettin in the branch of Saxe- Jena and by marriage Duchess of Saxe- Weimar.
She was the fourth child of Bernhard II, Duke of Saxe- Jena by his wife Marie Charlotte, daughter of Henry de La Trémoille, 3rd Duke of Thouars, 2nd Duke of La Tremoille, and Prince of Talmond and Taranto.
The early death of her two brothers and older sister before her own birth left Charlotte Marie as the only child of her parents for several years, until the birth of her younger brother and future 2nd Duke of Saxe- Jena, Johann Wilhelm in 1675.
Marie Charlotte de La Trémoille
Marie Charlotte de La Trémoille (26 January 1632 – 24 August 1682).
was a French noblewoman member of the House of La Trémoille and by marriage Duchess of Saxe-Jena.
Born in Thouars, she was the fifth of six children born from the marriage of Henri III de La Trémoille, 3rd Duke of Thouars, 2nd Duke of La Tremoille, Prince of Talmond and Taranto, and Marie de La Tour d'Auvergne.
Bernhard II, Duke of Saxe-Jena
Bernhard II, Duke of Saxe-Jena (Weimar, 14 October 1638 – Jena, 3 May 1678), was duke of Saxe-Jena.
He was the seventh child but fourth surviving son of Wilhelm, Duke of Saxe-Weimar and Eleonore Dorothea of Anhalt-Dessau.
Bernhard attended the University of Jena from February 1654 until November 1657.
Subsequently, he was pulled into political affairs when his father sent him to Paris in order to strengthen the relations of Ernestine line with the King Louis XIV, hopefully through a marriage.
The French king, however, made him wait eighteen months for an audience.
The stay in France finally led to his marriage to Marie Charlotte de la Trémoille, daughter of Henri de La Trémoille and Marie de La Tour d'Auvergne.
Her family were residents of the French court where they bore the rank of "princes étrangers".
The wedding took place in Paris on 10 June 1662.
Shortly after, the couple moved to Jena, where their five children were born:
In 1662 Bernhard and his brothers divided the paternal inheritance, and he received Jena.
The marriage of Bernhard and Marie Charlotte was totally unhappy, and, were they seemingly irreconcilable, the duke had decided to marry one of the ladies of his court, Marie Elisabeth of .
He solemnly promised that he would divorce his wife and marry her, and she ceded to his advances.
They had one daughter:
Meanwhile, Bernhard's efforts to have his marriage annulled were unsuccessful, as no theologian or jurist could give him grounds for divorce; and he appeared to reconcile himself with Marie Charlotte.
Nevertheless, on 20 October 1672 he promised in writing to his mistress that he would never forget her, but would care and protect her as if she were his true wife, and giving her the style of "Lady of Alstädt" and an annual rent of 1000 Taler.
Then, in 1674, they were married by a former Jesuit priest named Andreas Wigand, converted to Lutheranism in 1671.
Thus, Bernhard became one of the few cases of bigamy among princes.
The contract declared the children to be legitimate and noble, until such time as an Imperial Act could bring them to a higher rank.
She was given as "Morgengabe" a sum of 20,000 Taler and assigned the Schloss Dornburg as her residence.
She was obliged to keep the marriage secret until the death of the duke's first wife; should she reveal it
, the duke would cease to be bound by the contract.
On 8 November 1676
Marie Elisabeth was raised by the Emperor to the rank of an Imperial Countess ("Reichgräfin"), along with her daughter, and any other legitimate children of hers, with the title of Countess of Altstädt ("Gräfin von Altstädt") and the style of hoch- und wohlgebohrne.
When Bernhard died, was succeeded by his only surviving son Johann Wilhelm, born of his first wife after their reconciliation in 1675.
Marie Elisabeth obtained her "Morgengabe", not without some difficulty.
She survived her "husband" thirty-eight years.
Christian III Maurice, Duke of Saxe-Merseburg
Christian III Maurice, Duke of Saxe-Merseburg (Merseburg, 7 November 1680 – Merseburg, 14 November 1694), was a duke of Saxe-Merseburg and member of the House of Wettin.
He was the eldest son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz.

Question: When did Bernhard Ii, Duke Of Saxe-Jena's wife die?
Answer: 24 August 1682