Prince Jean Charles de Ligne de La Trémoïlle (16 June 1911–9 July 2005), was a Belgian nobleman and the son of Prince Henri de Ligne and his wife, Princess Charlotte de La Trémoille (1892-1971), eldest daughter of the 13th and penultimate Duc de Thouars. Although a junior member of the House of Ligne, he founded a distinct cadet branch of that princely family: At the death of his childless maternal uncle, Louis Jean Marie de La Trémoille, prince étranger and last Duke of Thouars in France, Prince Jean Charles kept alive one of the most distinguished names in French history by having his uncle's surname, "de La Trémoïlle", legally appended to his own in Belgium.[1] The heir male (or, failing heirs male, the senior female) of this lineage is the primogeniture representative of the kings of Naples of the House of Trastámara, in dynastic descent from King Federigo IV, deposed and exiled in 1501, through Anne de Laval.
On 11 March 1942, he married in Paris, France Maria del Rosario de Lambertye-Gerbeviller, daughter of the Marquis de Gerbeviller. They had three children, all of whom married into princely families:
His legal title and style in Belgium was: "His Highness Jean Charles de Ligne de La Trémoïlle, Prince de Ligne."
However, as the House of La Trémoïlle was also of princely rank in France, members of this branch are commonly referred to as Son Altesse Prince/Princess Firstname de Ligne de La Trémoïlle.[1]