Try to think about the Roman Parade of Triumph.

The triumphator, his face and arms painted red, rode on an already ancient four wheeled car pulled by two white horses. A slave behind the triumphator held a laurel crown over his head (not touching it). Notably, this slave had to repeat continuously "Memento mori." ("Remember thou art mortal.") Some sources state that the slave would say; "Respica Te, Hominum Te Memento" ("Look behind you, you are only a man.")