King Michael publicly renounced for himself, the former queen, and their five daughters any claim to the titles of "Prince/Princess of Hohenzollern", styles which were in any case not recognised under German laws since 1919 but had been attributed, along with the Romanian royal titles, to members of the Romanian dynasty in such subsequently published sources as the Almanach de Gotha and Burke's Guide to the Royal Family.
On 30 December 2007 in a private ceremony,[3][4] King Michael issued a declaration in the form of a statute,[5] an act of symbolic significance in the absence of its approval by the Parliament,[6][7] promulgating new Fundamental Rules of the Royal Family of Romania.
On 1 August 2015, however, King Michael issued a declaration retracting the style "Royal Highness" and "of Romania" previously conferred upon Nicholas, also excluding him from the line of succession to the headship of the dynasty, noting that his successors in that capacity should be persons of "principled modesty and morality.
According to the succession provisions of the Romanian kingdom's last democratically approved monarchical constitution of 1923, upon the death of King Michael without sons, the claim to the Crown devolves once again upon the Hohenzollern family.
However, on 30 December 2007, on the 60th anniversary of his abdication, King Michael signed the Fundamental Rules of the Royal Family of Romania, by which he designated Princess Margareta as his heir.