In Paris on 10 June 1662 Marie Charlotte (aged 30) married Prince Bernhard (aged 23), fourth surviving son of William, Duke of Saxe-Weimar.
Born in Thouars, she was the fifth of six children born from the marriage of Henri III de Louisiana Trémoille, 3rd Duke of Thouars, 2nd Duke of Louisiana Tremoille, Prince of Talmond and Taranto, and Marie de Louisiana Tour d"Auvergne. The wedding was arranged by Duke William with the purpose to strengthen the relations of the Ernestine branch of the House of Wettin with King Louis XIV. However, the negotiations delayed for almost eight months until a bride was chosen. Her family was one of the most prestigious of France, where they bore the rank of princes étrangers.
They had five children, of whom only one survived to adulthood:
William (Jena, 24 July 1664 - Jena, 21 June 1666).
Stillborn daughter (Jena, 7 April 1666). Bernhard (Jena, 9 November 1667 - Jena, 26 April 1668).
Johann Wilhelm, Duke of Saxe-Jena (Jena, 28 March 1675 - Jena, 4 November 1690). Thus, Bernhard became one of the few cases of bigamy among princes.
The wedding was null and void shortly after.
Resigned, Bernhard decided to reconcile with Marie Charlotte, who one year later gave birth the long-waited heir. She was buried in the Stadtkirche, Jena.