Clovis La Britanniais the Third Prince of Britannia Empire and the Viceroy of Area 11 at the start of the series. When he and Lelouch were young he would often play chess with him, frequently losing Clovis viewed Lelouch as a friendly rival. His childhood memories of the time spent at the Imperial Villa led him to model the garden on top of the government complex after it. He is a talented artist and designer having planned the whole Clovisland amusement park and left a large amount of artwork behind.

Clovis was involved in the research on C.C. and others with Geass. He feared that his involvement might get him disowned were it made public. When C.C.'s capsule is stolen by some of the Japanese resistance members, thinking that it contained poisonous gas, Clovis quickly ordered the eradication of the Shinjuku ghetto to disguise his secret project. He once again plays an odd game with Lelouch who using the Resistance squad to help him defeat Britannia, but Clovis loses. Lelouch used his Geass to see Clovis. Clovis was the first to learn that Lelouch was alive, and the first to die by Lelouch, not before Lelouch used his geass to see if Clovis new anything about his mother's death.

Known relatives: Charles zi Britannia (father), Marianne vi Britannia (aunt), Lelouch vi Britannia (brother), Nunnally vi Britannia (sister), Odysseus eu Britannia (brother), Guinevere de Britannia (sister), Schneizel el Britannia (brother), Cornelia li Britannia (sister), Euphemia li Britannia (sister), Carine le Britannia (sister)