I have a friend who has developed the theory that when the Crusaders came back from the Crusades they all moved to Switzerland. By this theory, Switzerland is a country of warriors. It somewhat explains the safe secret banks... lack of wars - and at times stunning international strategy.
I’ve heard a version of that, but it wasn’t when they came back but when some of the orders where banned by the Vatican they took refuge there along with all the loot they collected.