A courtesan told Ezio Auditore that she knew where the Borgia who plotted with the foreign ambassadors were meeting. She asked Ezio to follow her and eliminate them.
Courtesan:The Senator and I have uncovered the planned meeting place of the Borgia and the foreign ambassadors. You have killed ambassadors, now those who plotted with them must be stopped. I can show you where, but I leave the rest to you. We must ride.
Ezio followed the courtesan to the meeting and killed the ones attending it.
Courtesan:Grazie (Thank you), Ezio! I will return to the Rosa in Fiore. The others will know of your bravery.
Ezio killed the Borgia conspirators at the meeting.