Chief Inspector Royall Britannias is a Chief Inspector of Scotland Yard, who appears in Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy.
History
Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy
Case 11
Britannias falsely accused Katrielle Layton of murdering Clover Pryce. He lied because he wanted to compete against Inspector Ercule Hastings as Hastings had solved more cases with Katrielle and Britannias wanted to be as popular as him.
Layton Mystery Detective Agency: Kat's Mystery Solving Files
Episode 35
Britannias has a minor appearance in this episode, where he helps Katrielle arresting the priest of the Cranscoll Cathedral in Southampton who captured her father, Professor Hershel Layton. Thereafter he accompanies her to the basement where they find the professor, captured in a coffin.
Spoilers end here