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 Alexander of Prussia substantial legacies, but the rest of his estate passed to his younger brother Prince George of Prussia, and after his death, to Alexander's godchild Prince Oskar of Prussia. Much was written about Alexander's supposedly promiscuous ways. In her 1915 work "Memories of forty years", Catherine Radziwill recalled that: "[Prince Alexander], though none too intelligent, was extremely fond of society, feminine society in particular. I remember that one day, at my mother-in-law's house, he managed to decoy into an empty room a certain Madame von Wildenbruch, the wife of an illegitimate son of Prince Louis Ferdinand of Prussia, and began kissing