Heir to the throne of France to wed . The Comte de Paris , with his father the Duc de Guise . As is well known the Duc de Guise , is as Head of the House of Bourbon , known to Legitimists as the rightful King of France . . His son , the Comte de Paris , is to marry Princess Isabelle d ' Orleans Bragance , at Palermo on April 8 , when there will be a record gathering of Royalties . The Prince lives with his parents in the Castle of Anjou , near Brussels . According to the French law of 1886 , the Duc de Guise and his heirs are not allowed to enter France . 16 March 1931