Paganino

Paganino (died 1503) was a member of both the Venetian Thieves Guild and the Roman Thieves Guild. He was also a covert Borgia spy.

Venice
During the late 15th century, Paganino was a member of the Venetian Thieves Guild led by Antonio de Magianis. He was a colleague and personal friend of Ugo and Rosa.

In 1481, Paganino and Ugo were confronted by Ezio Auditore da Firenze, who was carrying a wounded Rosa. After the group exchanged words about their Guild, Paganino helped Ezio and Rosa get safely to their headquarters, where Antonio resided.

Siege of Monteriggioni
Years later, Paganino became a spy for the Borgia, and gathered information on the Assassin Order. By January 1500, he had based himself in the Assassin headquarters in Monteriggioni.

In early January 1500, the Borgia attacked Monteriggioni, and Paganino stayed unnoticed in Mario Auditore's study in the Villa Auditore. He ran into Ezio again there, and Paganino asked him where the secret passage that Ezio was taking led to. After being told, Paganino left Ezio, saying that he had to "go help the troops."

Death
After the Colosseum Passion Play in August 1503, Ezio saw Paganino behaving suspiciously, and recognized him from the villa attack. As he called out to him, however, Paganino fled.

Ezio pursued and tackled him, and found that he was carrying Borgia documents. As the Assassin realized that Paganino was the traitor they had been searching for, not Macchiavelli, Paganino declared "Long live the Borgia!" before stabbing himself in the neck with Ezio's hidden blade.

Final words
The thief starts to run away, and orders the nearby guards around the Colosseum to attack Ezio. However, Ezio is able to avoid the guards, and continues to chase the thief, eventually tackling him. Ezio takes the letter the thief is holding and notices the seal of the Borgia. Ezio then threatens to kill him with his hidden blade.
 * Ezio: Un momento! (Hey!) You were at the Villa Auditore during the attack!
 * Ezio: Why did you run?
 * Paganino: I--
 * Ezio: You are the traitor, not Machiavelli.
 * Paganino: Long live the Borgia! (pierces himself in the throat with Ezio's blade.)
 * Ezio: Merda! I was right. I have to stop Volpe before he gets to Machiavelli.

Trivia

 * In the official artwork for the Siege of Monteriggioni, Paganino appears alongside Cesare Borgia at Monteriggioni's gate. However, in both the game and novelization of Assassin's Creed: Brotherhood, he is not present.
 * Paganino is the only character to commit suicide in Brotherhood, and is also the only one who did not receive last rites from Ezio.
 * Paganino commiting suicide using Ezio's blade is similar to that of what happened in the short film "Assassin's Creed: Lineage" When Giovanni confronts a messenger sent by Marco Barbarigo by pressing his hidden blade to his throat, the messenger says to Giovanni "My life is not yours to take. And my secrets come with me. See you in hell" and then forces Giovanni's blade into his throat.