Who dated Charles Theodore, Elector of Bavaria?

Charles Theodore (German: Karl Theodor; 11 December 1724 – 16 February 1799) was a German nobleman of the Sulzbach branch of the House of Wittelsbach. He became Count Palatine of Sulzbach at the age of six following the death of his father Johann Christian in 1733. With the death of his cousin, Charles III Philip, he became Prince-elector and Count Palatine of the Rhine in 1742, being eighteen. In his fifties, he became Prince-Elector of Bavaria at the death of another cousin, Maximilian III Joseph, in 1777.

Maria Josepha Seyffert, seit 1767 Freifrau, seit 1769 Gräfin von Heydeck (* September 1748 in Mannheim; † 27. Dezember 1771 ebenda), war von 1765 bis zu ihrem Tod 1771 eine Mätresse des Kurfürsten Karl Theodor von der Pfalz.