The Elephant's Greek Heritage
It's a common misconception that the name Elephant & Castle is a corruption of "Infanta de Castilla". This isn't true: it actually stems from the words "Bellephron and castor oil". In Greek mythology, the hero Bellephron trained the winged horse Pegasus by walking it around the roundabout now taken up by the lumpen Faraday memorial.
Where the castor oil bit comes from is uncertain. Possibly one of them had an upset stomach at the time.