Uhg.
It’s not Excalibur. It’s durendal
It was carried by Roland, a paladin of Charlegmane’s court. The sword that was at Rocamdor was a replica (or a fake.
As an incorrigible nerd, I take offense at confusing magic swords like this….
Also. It’s not the only sword in stone. There’s the sword of St. Galgano Italy