a system was set up to govern labour relations. Furthermore, women obtained the right to vote in parliamentary elections in 1948. Also during his regency the Benelux customs union was formed, Belgium became a member state of the United Nations, and the North Atlantic Treaty was signed. In 1950, Charles's regency ended when Leopold III returned to Belgium and resumed his monarchical duties, following a plebiscite. Charles retired from public life, taking up residence in Ostend and becoming involved in artistic pursuits. Having taken up painting, he signed his works: "Karel van Vlaanderen" (Charles of Flanders). He was the 377th knight Grand Cross of the Order of the Tower and Sword. Charles had a natural daughter, Isabelle Wybo, born in 1938 as the result of a relationship with Jacqueline Wehrli, the daughter of a Brussels baker. Her existence was largely unknown until a biography of the prince was published in 2003. Wybo made an official appearance with her first cousin-once removed, Prince Laurent in 2012. He died on 1 June 1983 in Ostend, predeceasing his elder brother by a few months, and was buried at the Church of Our Lady of Laeken in Brussels. In his will he left the Empress Josephine's diamond tiara to his sister, Marie-José. Alleged marriage It is reported that Prince Charles, Count of Flanders, married Louise Marie Jacqueline Peyrebrune (16 February 1921, in La Réole – September 2014, in Saint-Hilaire-de-la-Noaille), formerly Mrs. Georges Schaack, daughter of Alfred Peyrebrune and Marie Madeleine Triaut, in a religious ceremony in Paris on 14 September 1977. This marriage has been mentioned in every edition of the revived Almanach de Gotha. However L'Allemagne Dynastique doubts this assertion, affirming instead that not only was there no civil marriage but that there was also no religious one (which could not take place before a civil marriage, according to French Law). No such religious marriage is registered in the Parish registers of Saint-Pierre-de-Montrouge, but a mere private blessing eight months after the death of her husband given by Father Marcelino Carrera was registered: "The private blessing uniting before God Charles Theodore Count of Flanders and Louise Marie Jacqueline Peyrebrune was given at Saint Peter's at the altar of the Sacred Heart on 14 September 1977. The mutual consent was received by your humble brother in Christ (Fr. Carrera) in the presence of Father Keller and witnesses (Comtesse Annie de Bergeret and Mme. Marie