Some questions.

[ReluctantSamurai]

Never ever have more then 50,000 denarii in your treasury or your line of succession will become so corrupt they will be virtually useless.

I used to try and achieve that when I first started playing. With non-barbarian factions, you eventually get to a point where you simply cannot spend more than you are earning unless you just give it away......not always a recommended thing

Once I figured out how to attain ZPG for most of my cities, there was no need to keep governors, so no need to worry about corruption. You will have collected a bunch of ancillaries that counter-act things like corruption, poor farmer, poor trader, and all the other myriad of traits that lower income/loyalty/law&order.....etc.

Law and order are the biggest issues after your cities reach 24k, anyways. I'd rather be making 30-50k per turn, and spending what I want, when I want, than worrying about corruption. I send my best family members out to fight the enemy, rather than baby-sit a bunch of ungrateful peasants, anyways

My last campaign....some while back.....as Armenia, I had in excess of 3,000,000 denarii in my account. But I could maintain an unbroken line of Legendary Cavalry generals with 10 command stars and a list of good traits longer than his sleeve for over 100yrs. Just keep 'em out of the cities.........

That's why i only build temples to Mars as the Brutii nowadays.

One has to be very selective with the Mars temple as it leads to some bad anger management problems that can be even more crippling than corruption. When I was still playing Roman factions, I only built it in Croton and a few selected cities in Greece that I used as training centers for the +3 exp bonus. Juno and Mercury both give better ancillaries than Mars, and Juno at the Pantheon level will give +2 exp, anyways.