Didn't know if this belonged in ancients... Or world... Or... https://www.livescience.com/pirate-henry-every-treasure-coins-discovered.html
Apparently there’s some dispute about the finder’s claims. Oliver Hoover wrote a convincing rebuttal, in fact. I believe it saved on the ANS blog page.
The above article also references another article by Oliver Hoover, "The Real Forgotten Coins Of North America: Islamic Gold, Silver, And Copper From The Eastern Trade" in the Colonial Newsletter, December 2013. It's on the Newman Numismatic Portal at: https://nnp.wustl.edu/library/book/514017 Few Islamic coins from the Colonial period have been found but they are mentioned in writings of the period.