Illustrious Highness
On 9 November 1918, all other legitimate cadet male/female members of the younger Lippe-Weissenfeld branch were also upgraded from the title of Count/Countess with the style Illustrious Highness and granted the title of Prince/Princess with the style of Serene Highness by Leopold IV, Prince of Lippe, who officially renounced the throne of Lippe three days later, on 12 November 1918.