Here we go: the War of St. Joan’s Ring.

This will not end well.

https://twitter.com/ShaftonP/status/712736028264534016

…What? It’s Europe! They had a war one time over somebody’s ear. You don’t think that they won’t throw down over St. Joan’s Ring? …Well, probably not; but if you can’t run an adventure around this hook then there’s no help for you as a GM.