Lord Protector of the Realm

Lord Protector of the Realm was a title in the Terran Empire given to a person responsible for ruling the Empire until the heir to the throne was old enough to assume office.

In 2155, $𝜇$ planned on declaring himself Lord Protector once he deposed Empress $𝜇$ and $𝜇$ was able to produce a living child from both Shran's and Sato's genes.