I believe it was Abbot Arnaud-Amaury...
"I believe it was Abbot Arnaud-Amaury"
Back when the ( Airborne) shirt was popular I used the description I posted, is that accurate?
You are correct. It was a churchman (Amaury) referring to Albigensian heretics during a siege in the Langedoc region of France. When asked how the soldiers were to know the difference between the heretics and the regular citizens of the town, he responded as you quoted ("Kill them all; God will know his own.")...