One of the great things about Roma Surrectum are the cool new factions that dvk has included in the mod. Not only does he have the Kingdom of Epirus, which a number of recent mods have also included, but he's the first modder to my knowledge to include three Greek colonian states as fully playable factions: Syracuse, Pergamum, and my personal favorite, the Kingdom of the Cimmerian Bosporus.
The Bosporan Kingdom is a fascinating piece of history that's been mostly forgotten -- certainly the Creative Assembly seem to have entirely ignored it! This was a kingdom descended from Greek colonists based in the Crimea and along the Black Sea coast.

The Kingdom lasted for many centuries, remaining semi-independent even at the height of Rome's power, and was eventually snuffed out -- according to the Penguin Atlas of Ancient History -- by the Ostrogoths in the 4th century AD. Of the demise of the Bosporans, the Pengiun Atlas says:
In the early fourth century the eastern Ostrogothic branch rapidly expanded; this expansion became explosive under King Ermanarich who extended Ostrogothic hegemony northwards into the Baltic; he also advanced his eastern frontier across the Don, and occupied the Bosporan Kingdom, for centuries a sleepy Roman protectorate.
In fact, given that the Bosporans first appear in the Pengiun Atlas on the map for 375 BC, and don't vanish until the 363AD map, they are one of the longest-lived political entities noted in the Atlas, having lasted for over 700 years!
Wikipedia has a good page about the Bosporans, with the following overview:
The Bosporan kingdom or the Kingdom of the Cimmerian Bosporus was an ancient state, located in eastern Crimea and the Taman peninsula on the shores of the Cimmerian Bosporus. It is interesting as the first truly 'Hellenistic' state -- in the sense of one in which a mixed population adopted the Greek language and civilization.
The prosperity of the Bosporan Kingdom was based on the export of wheat, fish and slaves, and this commerce supported a class whose showy wealth over the centuries is still being dug out, often illegally, from numerous burial barrows or kurgans. The once thriving cities of the Bosporus have left extensive architectural and sculptural remains, while the kurgans continue to yield spectacular Greco-Sarmatian objects, the best examples of which are now preserved in the Hermitage in St. Petersburg.
http://en.wikipedia.org/wiki/Bosporan_Kingdom
Another interesting tidbit from a site about the Black Sea:
It was the fish that attracted the Hellenes to the Black Sea shores, and fishery became the main industry of the early colonies: salted and smoked Black Sea fish was shipped to Greece. Later the colonists developed agriculture on fertile soils around settlements - and for a long time Black Sea colonies (later states independent from metropolises) were the main suppliers of wheat and wine for Ancient Greek states. Especially successful and important was the Bosporan Kingdom prospering on both sides of the Kerch strait.
My first extended campaign for Roma Surrectum had to be as the Bosporans -- ever since I suggested them as a possible faction to dvk, I've been dying to see what I could do as the master of the Black Sea. In this thread I'll be relating the story of my campaign and hopefully getting some of you excited to play this fantastic faction once Roma Surrectum is released in a couple of weeks.
More coming soon...