(covers information from several alternate timelines)
Sir Winston S. Churchill was a Human who served as Prime Minister of Old Britain during Earth's World War II.
In 2152, Malcolm Reed compared a speech of Chancellor Kultarey, a political leader of Gosis' species, to those of Churchill before World War II. (ENT: "The Communicator")
In an alternate timeline, Churchill made a wartime unity speech to improve Allied morale which was broadcast over radio in 1944. Aboard Enterprise, Hoshi Sato picked it up and replayed part of it for T'Pol, Tucker, Reed and Mayweather: "…as to the youth of all the Britons, I say, 'You cannot stop.' There is no halting-place at this point. We have now reached a stage in the journey where there can be no pause. We must go on. It must be world anarchy or world order." (ENT: "Storm Front")