Games you remember playing but can't remember the name

[Kurton]

The protagonist is a time-traveler with the ability to precisely camouflage himself as anyone he sees. The setting is some ancient Greek or Roman city where everyone has gone to see some event, with you making use of this opportunity to snatch some macguffin or other. It featured live-action recorded actors as characters.

Ankh: The Tales of Mystery?

Did a quick search and I'm afraid that's not it, but thanks for the guess.