Part of Notre Dame on fire.

[BrianSoddingBoru4]

There's just no reason to believe it's genuine other than faith, since it only appeared in history more than a thousand years after the event took place, like every Jesus story or artifact I can think of.

Actually, the Crown was alluded to as a physically persevered relic as early as the third century.

I don't believe that the Crown at Notre Dame (or any of its various fragments scattered here and there) is genuine.  But there's no real evidence that it isn't genuine.

Boru