On 10 May 1940, Germany invaded Luxembourg, beginning a four-year occupation. Having been warned of an imminent invasion, the Grand Ducal Family escaped the previous night. At first, they sought refuge in Paris, before fleeing France only weeks later. The Grand Ducal Family sought refuge in the United States, renting an estate in Brookville, New York. Jean studied Law and Political Science at Université Laval, Quebec City.
Prince Jean (born 15 May 1957). Married Hélène Vestur (born 1958) in 1987 and has issue. Renounced the right of succession for himself and his descendants on 26 September 1986. His children, as well as his wife, bore the title Count(ess) of Nassau until given the title HRH Prince(ss) of Nassauon 24 November 2004. Prince Jean and Hélène were previously divorced and she was not upgraded under this decree. In 2009 he married Diane De Guerre.
5 January 1921 – 12 November 1964: His Royal Highness The Hereditary Grand Duke of Luxembourg, Hereditary Prince of Nassau, Prince of Bourbon-Parma
12 November 1964 – 7 October 2000: His Royal Highness The Grand Duke of Luxembourg, Duke of Nassau
7 October 2000 – present: His Royal Highness Grand Duke Jean of Luxembourg, Duke of Nassau
His full title is "by the Grace of God, Grand Duke of Luxembourg, Duke of Nassau, Count Palatine of the Rhine, Count of Sayn, Königstein, Katzenelnbogen and Diez, Burgrave of Hammerstein, Lord of Mahlberg, Wiesbaden, Idstein, Merenberg, Limburg and Eppstein." Many of the titles are held without regard to the strict rules of salic inheritance.
Jean renounced the titles of the House of Bourbon-Parma for himself and his family in 1986 when his eldest son, then-Hereditary Grand Duke Henri married Maria-Theresa Mestre. The reason for this was that the Duke of Parma, Carlos Hugo, ruled the marriage unequal in 1981, as well as the marriage of Prince Jean to Hélène Suzanna Vestur in 1987, for which he had renounced his rights to Luxembourg in 1986. It is not known if the marriage of Prince Guillaume was seen by Carlos Hugo as equal.
The Arrêté Grand-Ducal of 21 September 1995 established that the title of Prince/Princesse de Luxembourg is reserved for the children of the sovereign and the heir to the throne. It also stated that the descendants in male lineage of the sovereign should be styled as Royal Highnesses and titled Prince/Princess of Nassau and that the descendants of unapproved marriages should be styled as Count/Countess of Nassau.
Henri's patriline is the line from which he is descended father to son.
Patrilineal descent is the principle behind membership in royal houses, as it can be traced back through the generations - which means that if Grand Duke Jean were to choose an historically accurate house name it would be Robertian, as all his male-line ancestors have been of that house.
Jean's patriline is the line from which he is descended father to son. It follows the Dukes of Parma as well as the Kings of Spain, France, and Navarre. The line can be traced back more than 1,200 years from Robert of Hesbaye to the present day, through Kings of France & Navarre, Spain and Two-Sicilies, Dukes of Parma and Grand-Dukes of Luxembourg, Princes of Orléans and Emperors of Brazil. It is one of the oldest in Europe.