CTD in year 157 BC

[Raygereio]

Have you tried the suggestions from this helpfull thread?

The section: "The game crashes as soon as I end turn / The game crashes during the AI turn." woud apply here, no?
The first thing I'd check for is Saka-owned revolting cities.

Edit: 'revolting cities'? Huh... I'm just going to leave that in there.