Tsar Nicholas II and the Tsarina of Russia in the early 20th century. (PROSE: The Wages of Sin) When Charlotte Pollard said to the Eighth Doctor, "you might just be the oddest man I ever met", the Doctor said that was exactly what the Empress Alexandra said about the Doctor soon after his train journey to Petrograd with Lenin. He also said that Alexandra enjoyed playing games. (AUDIO: Storm Warning)
This topic might have a better name.
While dab rules make sense for fictional characters only known by a single name, historical figures with one name probably need an easier name to search for rather than trying to see if it's somewhere on a disambiguation page.
Talk about it here.