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Leonius was a member of the Roman branch of the Hidden Ones who operated in the Roman Empire during the 1st century. After his assassination of the tyrant emperor Caligula, he became legendary among the Assassin Brotherhood.


The Hidden Ones concluded that the Roman emperor known pejoratively as Caligula was a tyrant backed by the Order of the Ancients and the land had to be freed of him. On 24 January 41 CE,[1] Leonius stabbed Caligula with a dagger in an underground corridor beneath Palatine Hill, killing him.[2]


By the time of the Renaissance, a tomb dedicated to Leonius had been erected beneath Santa Maria della Visitazione in Venice, Italy. The Italian Assassin Ezio Auditore explored the tomb and took the hidden seal from the tomb's sarcophagus, which later allowed him to obtain the Armor of Altaïr Ibn-La'Ahad sealed in the Sanctuary beneath the Villa Auditore in Monteriggioni.[3]

Behind the scenes

Historically, Caligula was assassinated by Cassius Chaerea, one of the Praetorian Guard.




  1. Wikipedia-W-visual-balanced.svg Caligula on Wikipedia
  2. Assassin's Creed IIFloating conversations: Unlocking Monteriggioni's Secrets
  3. Assassin's Creed IIVisitazione's Secret