Siege of Viana
King John III of Navarre ordered his brother-in-law, Cesare Borgia, who had just escaped from prison, to lead his 10,000 men to Viana, in order to retake the Viana Castle from Louis de Beaumont, the Count of Lerin.
On learning of Cesare's location from the Apple of Eden, Ezio Auditore da Firenze, Mentor of the Italian Assassins, traveled to Viana to assassinate the Templar Grand Master. In 1507, Ezio and Cesare finally confronted each other for their last battle.
Viana was also home to Castel Viana, a large fortified palace held by Louis de Beaumont. The castle was an extremely strong natural fortification, and due to it being almost impenetrable, Cesare had to rely on wearing his opponent out to win the battle.
- Like Arsuf in Assassin's Creed, Rome in Assassin's Creed II, and Masyaf in Assassin's Creed: Revelations, Ezio could not return to Viana through methods of travel after the completion of its memory. However, he was able to return to the location during a memory replay.