Question: Of Hans Pfitzner and Gaetano Donizetti, which composer's work was produced earlier? 
Sentence (from "Il furioso all'isola di San Domingo"): Jacopo Ferretti, who since 1821 had written five libretti for Donizetti and two for Rossini (including "La cenerentola"), had proposed the unusual subject and he was contracted to write the Italian libretto based on a five-act play of the same title by an unknown author in 1820, which "had been given in the same theatre [...] and which Donizetti had immediately loved".
Relevant evidence: No