Amyar:

Please, Parmenio, post acceptable Historical suggestions, not Hollywood style ones...
Apologies, just paraphrasing Tactius:

"On the opposite shore stood the Britons, close embodied, and prepared for action. Women were seen running through the ranks in wild disorder; their apparel funeral; their hair loose to the wind, in their hands flaming torches, and their whole appearance resembling the frantic rage of the Furies. The Druids were ranged in order, with hands uplifted, invoking the gods, and pouring forth horrible imprecations."

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Ranika:

There is no proof to one group of druids controlling all of the Celts. I'm interested in knowing YOUR sources.
http://en.wikipedia.org/wiki/Druidry

This is a typical example of the stuff I trawled through, all very basic material I assume?

Celtic was a race, and a blanket term for numerous, very different cultures.
Yet were there not tall fair celts as well as short dark celts? I thought it was the culture that defined them rather than race? Admittedly 'Celt' is a Greek and Roman description of a widespread people or peoples.

But all archaeological evidence points to them being VERY different.
Ah... I am totally unfamilar with any of this, though it answers my question as to your sources. You sound quite authorative on the matter though, so I'll bow to your wisdom.

Aside from being horrendously ahistorical in that the druids were not the same people everywhere, this idea also presents a technical problem that is also ahistorical. Factions tied to the 'senate' faction cannot fight one another. As stated, the Gauls and Britons DID fight, especially over Hibernia. Also, there can only be one 'Senate' faction, I'm fairly sure, and that one is in Rome. More over, it'd take up a province the Britons need. And even more so, your unit suggestions show a complete lack of knowledge of British Celt HISTORY. This is a historical accuracy mod, not some fluff bunny dumbed down version of the Celts, as portrayed by over zealous new agers, and lazy pan-world history professors who don't want to take a few hours to learn about the Celts.
I was thinking more along the lines of MTW's Papal system, where the Pope objects to christian factions fighting each other, rather than the Roman Senate as such. I'm sorry if I failed to communicate that. From what you have posted I now agree that a single such 'council' faction would be inappropriate to the Celts as a whole, and - as you have kindly pointed out - entirely impossible to implement, answering my other intial question.

I do however believe mission systems - representing councils or otherwise - for all the factions in RTW would benefit the game if it was possible to implement them. It's something that seems missing after playing MTW.