Childeric

Childeric was the son of Pepin VI and Berengaria.

Destiny
As was tradition the king had two sons, one good and one bad. Childeric was bad. He was destined to attempt to usurp the throne of his brother, Pepin VII.

Coronation
After the death of Pepin VI, his brother was to be king. At Pepin's coronation, Childeric attempted to announce himself a god after Pepin decreed he himself wasn't. The Doctor and Frobisher landed amidst the service. Initially they were seen as godly ambassadors, but they revealed they weren't. With that Childeric ordered their death. However, Eugene Tacitus saved them by saying all previous kings experienced mental fatigue after their coronation.

Plot
Childeric took on Clovis, the high priest, as an ally. They planned to kill Pepin by supernatural means, confident that he was immortal. (BFA: The Holy Terror)