Princess Frederica Dorothea "Louise" Philippine of Prussia, was a member of the House of Hohenzollern, and was a niece of which King of Prussia from 1740 until 1786, the longest reign of any Hohenzollern king?
Princess Louise of Prussia (1770–1836) Princess Frederica Dorothea "Louise" Philippine of Prussia (24 May 1770 - 7 December 1836) was a member of the House of Hohenzollern. She was a niece of Frederick the Great, being the second daughter and third child of Prince Augustus Ferdinand of Prussia by his wife Margravine Elisabeth Louise of Brandenburg-Schwedt.
Princess Hilda of Nassau Princess Hilda Charlotte Wilhelmine of Nassau (5 November 1864 – 8 February 1952) was the last Grand Duchess of Baden. She was the daughter of Adolphe, Grand Duke of Luxembourg, who was Duke of Nassau until he was deposed in 1866.