Gifts to Caesar improve the Emperor's mood, but you shouldn't do it too often.
When you give a gift, any subsequent gifts within a 12-month period will reduce the favor it brings:
Each gift size has 4 types (giraffes, etc). Once you give a gift of a certain size, the next type is chosen.
Requests can give favor, but also reduce it if you ignore requests.
So in total, if you ignore a request your favor will reduce by 8 points (3 for missing the first deadline, 5 for missing the second).
Every year, Caesar evaluates you based on these criteria:
Base change is -2 points, except for the two tutorial missions (unnamed one and Brundisium).
If you fail to pay tribute, you get a favor penalty:
|Not paid last year only||-3|
|Not paid for 2 years||-5|
|Not paid for 3+ years||-8|
If the current mission's rank is citizen and you pay yourself a salary: penalty is the number of ranks above citizen you pay yourself.
If the current mission's rank is above citizen:
Some scenarios have milestones set: in year X you must have 25% of the target ratings, in year Y 50% and in year Z 75%. The target ratings are the culture, prosperity, peace and favor ratings, and population.