Prince Johannes Heinrich of Saxe-Coburg and Gotha-Koháry (Johannes Heinrich Friedrich Werner Konrad Rainer Maria; Slovak: Ján Henrich, Hungarian: János Henrik; 28 March 1931, in Innsbruck – 14 April 2010, in Innsbruck)^{[1][better source needed]} was a prince of the House of Saxe-Coburg and Gotha-Koháry and the last holder of Csábrág and Szitnya, both in modern-day Slovakia, lost to the communist regime of Czechoslovakia. He was the only son of Prince Rainer of Saxe-Coburg and Gotha by his first wife, Johanna Károlyi von Károlyi-Patty und Vasvár.^[1]

In Munich on 24 October 1957, Johannes Heinrich married, firstly, Baroness Gabrielle von Fürstenberg (22 June 1921 – 5 October 2007). They had one daughter:

• Princess Felicitas of Saxe-Coburg and Gotha-Koháry (b. Sorengo, 6 April 1958), an art historian,^[2] who married Sergei Sergeyevich Trotzky (b. 1948; sometimes credited von Trotzky),^[2] a jurist^[2] who comes from an old Russian noble family,^{[citation needed]} on 15 November 1987 in Munich. They have six children:^[1][3]
  • Konstantin Trotzky (b. 16 March 1988)
  • Marie-Eudoxie Trotzky (b. 29 June 1989), who married Count Leo Czernin von und zu Chudenitz in September 2017.
  • Nikolaus Trotzky (b. 9 July 1991)
  • Xenia Trotzky (b. 25 February 1993), who married Count Frederic von Brandenstein-Zeppelin on 11 June 2022.
  • Tatjana Trotzky (b. 1998)
  • Alexander Trotzky (b. 21 May 2003)

Johannes Heinrich and Gabrielle were divorced on 4 July 1968. Four months later, in Munich on 12 November 1968, Johannes Heinrich married, secondly, Princess Mathilde of Saxony, a medical doctor and granddaughter of King Frederick Augustus III of Saxony. They had one son:

1. Prince Johannes of Saxe-Coburg and Gotha-Koháry (17 November 1969 – 21 August 1987).

Johannes Heinrich and Mathilde divorced on 27 August 1993.

After the death of Johannes Heinrich, the heir to the House of Saxe-Coburg-Gotha-Koháry is the former King Simeon II of Bulgaria, due to the exclusion of Johannes Heinrich's uncle Philipp's morganatic marriage on 23 April 1944 to Sarah Aurelia Halasz, and his descendants (their only son and four grandchildren were barred from the succession).