Wikipedia!

In late 1553 or 1554, Suleiman the Magnificent, the reigning Sultan of the Ottoman Empire, issued a firman (royal decree) formally denouncing blood libels against the Jews.

The Catholic Church denounced blood libels in the 1960s.

- Wikipedia on Blood libel against Jews

(Okay, yeah, there were popes who weren’t happy about it much earlier than that - memorably Sixtus IV, and I do appreciate how there were at least four of Pope Sixtus - but I think the Church as a whole never paid much attention to papal policy on the matter. The blood libel was all local politics.)

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