We have already established that one of the biggest things that created societies is access to food. Plant Growth, 3rd level spell, doubles food production. Another thing we established was access to water. Create or Destroy Water, 1st level spell. Also, what if rats get in the grain and spoil it, or a well is fouled? Purify Food and Drink, 1st level ritual.
Rulers must make important decisions that affect the lives of their people. Augury, 2nd level spell, gives a sign of Weal or Woe to an action you plan to take in the next 30 minutes.
Rulers must make judgements, trying criminals to find who is guilty and who is not. Zone of Truth, 2nd level spell.