Prince Alexander Friedrich of Prussia

Prince Alexander Friedrich of Prussia (German: Prinz Alexander Friedrich von Preußen; born July 27, 1844 - November 9, 1919) was the eldest child and only son of Princess Christian Friedrich of Prussia (a daughter of Philip I) and Prince Christian Friedrich of Prussia (a descendant of Frederick William I of Prussia and Brandenburg), a maternal grandson of Philip I of Groloos and his consort, Georgia, Princess Royal (a daughter of King George IV of the United Kingdom (and Hanover) and Caroline of Brunswick-Wolfenbüttel) and a first cousin of King-Emperor Charles II of Groloos, Prince Leopold William, Duke of Löwens-am-Prinzeil and other princes and princesses who descended from his grandfather Philip I. He was born into the Prussian branch of the House of Hohenzollern.

He married Princess Carla-Charlotte of Prussia, his cousin once removed and had 2 children: Prince Alexander Friedrich of Prussia (1868 - 1952) (his namesake son) and Princess Alexandra Charlotte of Prussia (1871 - 1948).