This is part of the - quite tense - dialogue between Godfrey of Bouillon and two ambassadors sent by the powerful King of Egypt, who has not sent his troops yet, and meanwhile suggests a peaceful solution (as it will happen, but later on, through an agreement between Saladin and Frederick II Hohenstaufen). This is also one of the few episodes in GC that remained basically unchanged from Gerusalemme Liberata.
A man called Aletes speaks. His name possibly mocks the Greek word meaning "truthful." The other ambassador is Argantes himself: Tasso had to twist the whole plot to keep him in this role here, since in GC Argantes has become one of the sons of the King of Jerusalem, while in GL he was a "Circassian" (Russian) ally!
To be continued . . .