I have not added any mods, (not even unlocked the locked factions). Now that you mentioned it, maybe my faction's leader got many ancillaries, I can't remember what though. He won numerous battles so I guess he gained the "legendary commander" and "great vanquisher" traits. I didn't check the corruption level either, but given that my territories were close enough from one another I doubt it could have caused such troubles.
Anyway, despite my leader might have had ancillaries aplenty, my popularity among the plebs was at the bottom of the scale. Thus I was no great threat for the Senate and so were the two other families.
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