- This article is a stub. You can help the Gabriel Allon Wiki by expanding it.
Karl Bruner was the head of the Swiss Guard security for the Pope.
When Brunner saw Gabriel, he recognized him from the photo that had been circulated of the "papal assassin" and attacked. He backed off only when ordered to do so by the pope. Brunner told Gabriel that protecting the pope was his (Brunner's) job.
Bruner was killed in the attack on Pope Paul VII.