Power is a measure of a ruler's influence and ability to govern.
There are four types of power, each corresponding to a character attribute:
Military Power represents the 'virtus' of a ruler and is based on their martial attribute. Military power is used to get new military traditions, inspiring 'devotio' and to activate unique unit abilities.
Civic Power represents the 'gravitas' of a ruler and is based on their finesse attribute. Civic power is used to get inventions, set up trade routes and relocate pops.
Oratory Power represents the ‘dignitas’ of a ruler and is based on their charisma attribute. Oratory power is used to fabricate claims, improve relations, enact laws and endorse parties.
Religious Power represents the ‘pietas’ of a ruler and is based on their zeal attribute. Religious power is used to increase stability, convert pops and call omens.
Technology progress is not dependent on power but instead on citizens output.