Clovis la Britannia is the first antagonist in Code Geass: Lelouch of the Rebellion. He's the third prince of the Britannian Imperial Family and of the Holy Britannian Empire as well as the half-brother of Lelouch vi Britannia. He first appears acting as the original viceroy of Area 11.
Clovis makes his "heart breaking" speech which turns out to be an act, which he boasts to the Britannian Nobles who watched him do it. Soon General Bartley Asprius informs Clovis that the poison gas has been stolen by the terrorists. Clovis orders all Knightmare pilots to recover the missing cargo now in the hands of the Japanese terrorists. Earl Lloyd deduces that the military's mission is to track the terrorists back to their hideout and eliminate them, and offers his help to the Prince. Lloyd is then told by Bartley that the terrorists captured a poison gas capsule which may be used as a weapon against Britannia. Clovis, believing the terrorists have eluded them, orders the complete eradication of the Shinjuku Ghetto. The young and eldery are killed mindlessly ina massacre.
As a result of the counterattack from the rebels that destroyed most of the Britannian Military, Clovis was forced to allow Suzaku Kururugi to pilot the experimental Knightmare Frame developed by Lloyd and the Special Envoys: Lancelot. Just as the Britannian Army corners the terrorists, Clovis orders an immediate cease fire under coercion by Lelouch vi Britannia. Clovis meets his attacker at gunpoint and is shocked to discover Lelouch is still alive, even though he was told he and Nunnally died during the Invasion of Japan.
Lelouch, after using his Geass on Clovis to uncover who murdered his mother, Lelouch discovers he knows nothing but suggests Lelouch goes to Cornelia or Schneizel for information. Lelouch then points his handgun at Clovis's head and pulls the trigger, killing him.
After his assassination, Jeremiah Gottwald captured Bartley for he is a suspect and Suzaku Kururugi was blamed for his death which made Jeremiah and his subordinates make an execution for Suzaku. Although Jeremiah fell under Lelouch's Geass, allowing Suzaku to escape, which made him even attack his subordinates. This made Jeremiah be demoted from five ranks.