I probably knew this at some point, because I read and enjoyed John Gimlette's Theatre of Fish, and he must surely have mentioned it. It doesn't seem to have registered.

Until I took an MA in medieval French, I didn't know that the crusaders had succeeded in winning a foothold in their Holy Land. I'd assumed such a crazy ptoject was doomed to failure, that they went off, fought for a bit and came home. Clearly all my information on the subject came from the story of Robin Hood...