If you were an emperor and were going to die soon and needed an heir, what steps would you take to help further assure you that the heir you were about to choose took things in the intended direction?
This was always an issue in Rome. People were afraid their heirs would turn out to secretly be wannabe dictators, and you couldn't do anything about it since you were dead. How would you go about making sure your heir was as close to your vision as possible, both outwardly and in their desires should they be emperor?
In ancient Rome, the sitting emperor often would choose a successor from, well anybody really, often not even a relation. They then adopted that person. If one has to have hereditary rulers, this seems a fairly sensible way to go about it.
I would probably keep my nephew in my summer palace after murdering his dad for being too popular and then killing the rest of our family around him. Caligula turned out well, although to be fair I only read up to his first year as Emperor...
Have a lot of kids possibly with different people for strategic purposes. Also develop relationships with my nieces and nephews. Hopefully they don’t kill each other for the power. This would raise the odds I’ll nurture at least one or two who would make decent decisions.