Vieri de' Pazzi
Vieri de' Pazzi (1454-1478) is a Pazzi nobleman and secretly a Templar.
Vieri is seen at the beginning of Assassins Creed 2 and he fights Ezio who was gathering people to fight his family for slandering the Auditore name. He is later seen just outside the Auditore family villa trying to kill him and what remains of his family. But Mario Auditore intervenes as he saves Ezio and beats Vieri's men. He is the second assassination target and killed at San Gimignano by Ezio.
Assassin's Creed 2
He apperently was an enemy of Ezio for unknown reasons as the two always seemed to fight each other like in the beginning of the game where Ezio his brother and other people fight Vieri and his men. During the fight Vieri hits Ezio in the face with a rock giving Ezio his scar in the same place like Altair and Desmond. In the end, Vieri loses the fight and runs away. Vieri and Ezio don't see each other again for awhile. The next time they meet Ezio is trying to escape Florence with his mother and sister. Vieri meets them on their way to Monterrigioni and attempts to kill them. However, he is thwarted in his attempt when Ezio's uncle Mario appears with mercenaries to protect the family. The next time they meet Ezio has been training as an assassin for a while and teams up with his uncle Mario to kill him. He is seen consulting with his father Francesco, his great-uncle Jacopo and Templar Grandmaster Rodrigo Borgia about an unknown topic (though it is likely they are discussing the plot to murder the Medici brothers). Vieri stays behind to defend San Gimignano. After several fierce battles Ezio and Vieri meet face to face again for the last time. Vieri is fatally stabbed ending the fight with Ezio as the winner. Before he dies Ezio demands Vieri for answers, but Vieri answers Ezio in the form of a question and dies. After Vieri dies, Ezio slanders his corpse and name but is stopped by Mario. Mario shows the deceased Vieri respect by offering words of blessing and closing his eyes. Vieri's family would sadly not last longer than him.
Final Words

Ezio: What are you and your allies planning? Is this what my father discovered? Is this why he was killed?
Vieri: I'm sorry, were you hoping for a confession?
(Outside the animus scence.)
Ezio: Pezzo di merda! Vorrei solo che avessi sofferto di più! Hai avuto la fine che meritavi! Spero che bru- (Piece of shit! I only wished you'd suffered more! You met the fate you deserved! I hope yo-)
Mario: (Interrupt Ezio) Enough, Ezio! Show some respect!
Ezio: Respect!? After all that's happened!? Do you think he would have shown either of us such kindness?
Mario: You are not Vieri. Do not become him. Che la morte ti dia la pace che cercavi. (May death provide the peace you sought.) Requiescat in Pace. (Rest in peace.) [Speak to Vieri as he closes his eyes.]
thumb|400px|left|Vieri de'Pazzi database video.
Trivia
- Strangely, Vieri's birth date appears to be 1454, whereas his father, Francesco, is 1444. A Possibility could be that Vieri could be adopted, though this is yet to be confirmed.
- His only desire was to kill Ezio.
- When not doing anything bad, he worked as a Race Host.
- He seemed to hate losing, as shown in the database video he would invite the winner of an event Vieri participated to a victory meal, and serve them food that was poisoned.
- Vieri is the one responsible for Ezio's scar, caused from a rock thrown from Vieri in the beginning of Assassin's Creed II.