This splashie is from the brilliant The Eagles of Rome graphic novel series, book two, by badass Swiss-Italian, writer-artist Enrico Marini.

I'd previously posted a few more samples on HistoryArt: [NSFW]
https://piefed.social/c/historyart/p/1701717/three-splash-pages-from-the-eagles-of-rome-series-nsfw-3rd-image

As I understand it, chariot-racing was an enormous event during the heights of the Roman Empire, and the OP pic is possibly the legendary Circus Maximus or an analogue, which I understand was duplicated in part all around the ancient Roman empire, even across a large swath of Northern Africa.

There's also a landslide of information to comment upon in terms of those colorful flags... the Reds, the Blues, the Greens, and the Whites. Each faction (plus a couple others) was backed by powerful financial - political entities, backed by hyper-enthusiastic fan-bases. (haha, fast forward 2Kyrs with futbol, and has anything really changed? XD)

In any case, the game I'm currently reviewing:
https://store.steampowered.com/app/297760/Qvadriga/

(check that lead video at the game link; it's both scrumptious and hilarious!)