Chapelle is a Character/NPC in The Witcher 3: Wild Hunt and appears in the book Sword of Destiny.
"Geralt and I had long known that Chappelle. Chancellor of Security for the Church of the Eternal Fire in Novigrad. had died years ago and been replaced by a doppler masquerading under his name. We didn't breathe a word of this to anyone, of course, for the change was decidedly in everyone's best interest. The doppler had proved a reasonable creature deprived of the true Chappelle's cruelty, and under his watch life in the city had much improved.
Sadly, the chancellor's conciliatory style must have raised suspicions as a wave of terror and persecution began to swell over Novigrad. The doppler was found out. arrested and burned at the stake for the greater glory of the Eternal Fire."