I was under the impression they hadn't. They just found it during the 1st Crusade. Prior, that society of the Brotherhood of The Cruciform Sword dudes were the ones that established the site as it's found.And again, no one has ever bothered asking how those 3 Brothers built that whole darn Grail Temple and built those traps in the first place.
Edit: Now I recall why I thought that. Indy's boat assailant said they'd been protecting the secret of the Grail for a thousand years or something, which would put it around 938, prior to the 1st Crusade by about 160 years
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