Sung by Fiordiligi.
Voice Part: soprano  
Fach: dramatic coloratura
Synopsis: Two mysterious Albanians that are really Guglielmo and Ferrando in disguise have shown up at the sisters' door accompanied by Don Alfonso. The two men attempt to woo the sisters. Fiordiligi will have nothing to do with it, though, and, in this difficult aria, declares her loyalty to Guglielmo and asks the strangers to stop attempting to win them.