Here's my Romani SPQR campaign and it's only at a measly 700 turns thus far,
but I'll share with you what I have thus far before I get to turn 1000. 
As you can see, for a long time the Roman Republic and Seleucid Empire dominated opposite sides of the map, with West Asia, Central Asia, and Eastern Europe basically in their hands. Western Europe, Southern Europe, and Northwest Africa fell into in mine, and for a brief moment around turn 500 it looked like two behemoths, long at peace with one another, would ignite the fires of war. Now, two-hundred turns later around 98 BC, it's basically just the Roman superpower and a cluster of other factions who are quickly eating away at the once mighty grey Seleucid giant. I had a two-decade long war with the Seleucids that wrecked my economy for a time, but when the dust settled I was in good shape and they rapidly declined into a full imperial collapse. Who shall be the next super power to challenge me? Step forth and be smited!
In the next 100 turns, I plan on turning back west and breaking my long-standing alliance with the Pritanoi, so that I can invade the British Isles, even Northern Ireland, because why not? Who's gonna stop me? The Seleucids? Nope. They dead. The remaining factions are just fighting over the scraps and they exist only due to my benevolence and graciousness.
The once proud Getai, Kimmerios Bosporos, and Pontos recently felt my wrath and my blade. Even my old ally, the Ptolemies, had to be put down like mad rabid dogs for their insolence.
Turn 100:
Turn 200:
Turn 300:
Turn 400:
Turn 500:
Turn 600:
Turn 700:
A Koinon Hellenon siege of a Roman huge city when I still had Polybian units in the mid-2nd century BC (they're using Libyan cavalry against me here):
Pictures from the campaign battle map: