An amphitheatre was a type of outdoor theatre. It was particularly favoured by the Romans as a place of gladiatorial combat. Ian Chesterton was once forced to fight another gladiator for the amusement of Caesar Nero in a 1st century amphitheatre. Chesterton only narrowly escaped having to fight a lion there. (TV: The Romans) In the 2nd century, the Tenth Doctor actually did have to face a lion — as well as a tiger and a bear — in the Flavian Amphitheatre. (PROSE: The Stone Rose) The Sensorites imprisoned the First Doctor in an amphitheatre on their world. (PROSE: The Monsters from Earth)