Answer:
Decisive actions
Step-by-step explanation:
The government of those people obviously had to have control over the population, like all countries today.
Do not think that governments back then were very different from our own. The governments we have now are based on the ones in the past.
The kind of leadership required is the one where the leaders listen to what is necessary to do for society. Not necessarily listen to the people, but to what needs to be done.
If there is a plague in one part of town, seal it and use lethal force to contain it.
Harsh but decisive and necessary actions.
The governments also had to keep up the army so that frequent foreign invaders could not ruin all your civilization has built.
Successful civilizations are the ones that managed to keep the people united and organized. Look at Egypt, Mesopotamia, the Roman Empire. They were all very organized and had achieved great economy.
Strength in numbers is an understatement.
The leader(s) can also not be short of actions. If there is a pressing matter that needs your immediate response, a weak leader is not appropriate. That's why dictatorships fall - the first leader is good at ruling, but his son might not have it in him.
The key is to keep the people organized and on the side of the government.
"Give them bread and circuses, and they will never revolt." -Juvenal