Assassin's Creed 2 Episode 13: The Merchant of Venice

"After arriving in Venice by boat from Romagna, Ezio and Leonardo da Vinci took a quick tour of Venice, led by a local, Alvise da Vilandino."
"While trying to find a way into Emilio Barbarigo's Palazzo, Ezio Auditore watched as Rosa and several thieves made an attempt to break in."
"Ezio visited Antonio de Magianis to offer his assistance to the thieves. Antonio was glad to hear this offer and gave Ezio three missions to make the assassination of Emilio Barbarigo less challenging."
"Upon deciding that the moment was right, Antonio de Magianis told Ezio Auditore that their greatest opportunity to assassinate Emilio Barbarigo had come."