https://en.wikipedia.org/wiki/Archimedes_Palimpsest
As much as I think it is proper to entertain the idea of the Mandela Effect, I too feel it proper to realize that it was a C_A brainchild.
You'd be amiss to not read Joseph P. Farrel's voluminous works on the matter. That'd be quicker and you'd learn more (imo).
Alan Wilson does a grand job of describing this suppression in British History. You should check his out if strikes your fancy. I've still never been able to locate his books for a reasonable price.