Rome: Total War/Factions

Unlocking more Factions for use in Campaign
More Factions can be unlocked for use in Campaign by successfully obtaining victory before rival factions in either the Normal Campaign (Become Supreme Ruler of Rome and hold at least 50 provinces), or the Short Campaign (Destroy or Outlast certain factions, hold at least 15 provinces)

Non-Playable Factions in Campaign

 * The Senate and People of Rome
 * Macedon
 * Thrace
 * Scythia
 * Dacia
 * Spain
 * Numidia
 * People of Pontus
 * Armenia
 * Rebels

Unlockable Factions in Campaign

 * Carthage
 * Egypt
 * Parthia
 * The Greek Cities
 * The Selucid Empire (Selucids)
 * Gaul
 * Brittania
 * The Germanic Tribes (Germania)

The Senate and People of Rome
The Senate and People of Rome are the big boss of the three starting Roman factions in the Campaign(The House of Julli, The House of Scipii, and The House of Brutti, each representing the historical Julian, Brutus, and Scipio families, respectively). They have only one city, Rome(which is the most advanced city when you start a Campaign). The Senators will assign missions to the three Roman starter Factions(including the player if he is playing as Julli, Scipii, or Brutti)in which they will have to complete a military task such as capturing an enemy settlement, blockading an enemy port with one of your fleets; a diplomatic task, such as getting trade rights, map information, or creating an alliance with another faction; or it could involve personal tasks, such as killing your own faction leader(Usually only happens when you get high influence over the Plebeians(People of Rome)which is required to overthrow the Senate and take over all other Roman factions and establish your own empire). Some of the missions have rewards for completing them such as money or unique Military units to be used in battle, or are required by the Senate or else they will put punishments upon you. All Senate missions will add popularity gained to the Senate in your Senate Floor.