Regents usually rule in the name of the Emperor. true
Explanation:
A regent is employed when a ruler is unable to, or not old enough to rule. The regents often wield a great amount of power over their king as they are the ones pulling the string while the emperor is young and susceptible to many things.
As the emperor grows up and becomes of age, it is said to be the duty of the regent to train them in statecraft and then help them take over their place as the ruler.