Elephant and Castle
A public-house sign at Newington, said to derive its name from the skeleton of an elephant dug up near Battle Bridge in 1714. A flint-headed spear lay by the remains, whence it is conjectured that the creature was killed by the British in a fight with the Romans. (The Times.)
There is another public-house with the same sign in St. Pancras, probably intended to represent an elephant with a howdah.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894