The Holy Britannian Empire is a fictional nation in the anime series Code Geass. It is depicted as a powerful and authoritarian empire that has conquered many territories, including Japan, which it renames Area 11. The empire is characterized by its strict social hierarchy and the use of advanced technology, including mechas known as Knightmare Frames. The empire is ruled by Emperor Charles zi Britannia, who leads with an iron fist and promotes the idea of Britannian superiority. The story follows characters like Lelouch Lamperouge, a former prince who seeks to overthrow the empire and create a better world. The conflict between the empire and various resistance groups drives the narrative of the series.