Trêve de Dieu
The Peace and Truce of God, pre-chivalry was a code for knights that weren't exactly the genuine paladins that history would paint them to be, but thugs with armor riding around the countryside taking what they wanted in every kind of sense. So the Peace and Truce of God was an attempt to give some kind of code and set of rules to those people. There's no obvious parallel with the band, but just generally speaking it had been a rough couple of years, and it had the feeling of being after a battle.