An elephant quadriga. Spectacular. Roman emperors liked a good show. History books are full of awe about Hannibal's war elephants, surprising the Roman legions. I wonder how big the surprise really was. Here is a coin commemorating Alexander's campaigns in India, struck in Babylon around 323 BC, about a century before Hannibal.
Obv: Alexander standing, being crowned as victor by Nike.
Rev: Greek rider, possibly Alexander, attacking an Indian battle-elephant, possibly during the battle against Porus.