Prince Henry of Prussia (1862–1929) became the club's patron. Henry was interested in motor cars as well and supposedly invented a windshield wiper and, according to other sources, the car horn. In his honor, the "Prinz-Heinrich-Fahrt" (Prince Heinrich Tour) was established in 1908, like the earlier Kaiserpreis a precursor to the German Grand Prix. Henry and his brother William gave patronage to the Kaiserlicher Automobilclub (Imperial Automobile Club). Henry also was an early proponent of introducing submarines and airplanes. He had merchant ships converted into seaplane tenders for operations in the Baltic Sea. Henry respected his brother, but this attitude was not returned in the
Prince Waldemar of Prussia (1868–1879) buried in the royal mausoleum attached to the Friedenskirche at Potsdam, near the main altar and his elder brother Prince Sigismund of Prussia. His parents were later buried not far away in the centre of the mausoleum directly under the dome. Prince Waldemar of Prussia (1868–1879) Prince Waldemar of Prussia (Joachim Friedrich Ernst Waldemar; 10 February 1868 – 27 March 1879) was the sixth child and youngest son of Crown Prince Friedrich (later Emperor Friedrich III), and Victoria, Princess Royal, the eldest daughter of the Queen Victoria. Waldemar was the favourite of both the Princess Royal and her husband. He