I did find this on Wiki about blood libel in Damascus 1840
Damascus affair - Wikipedia, the free encyclopedia
Later in Constantinople, Montefiore persuaded Sultan Abdülmecid I to issue a firman (edict) intended to halt the spread of blood libel accusations in the Ottoman Empire. The prevailing contemporary interpretation of this event is that of being a part of a long history of false blood libel charges against Jews
Damascus affair - Wikipedia, the free encyclopedia
Later in Constantinople, Montefiore persuaded Sultan Abdülmecid I to issue a firman (edict) intended to halt the spread of blood libel accusations in the Ottoman Empire. The prevailing contemporary interpretation of this event is that of being a part of a long history of false blood libel charges against Jews