I played a Roman campaign until a few turns pass the 2nd rebellion and stopped due to some issues that will be fixed in 2.6, I have also finished my Spartan Campaign objectives and just decided to wait for 2.6 before starting a new one, so while waiting I revisited Mount & Blade :Warband mods and found two very nice Single player mods that I wanted to share with the rest of RS II community.
First mod is Imperium Romanum.
Takes place in Britannia and you start with your own personal army.
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Second mod is The Peloponnesian War.
Takes place at about 400 BC and this is the one I like best as I get to be a Spartan Merc seeking his glory in Italy fighting for the Latin league or the Samnites. 
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