Leonius was a member of the Hidden Ones, operating in the Roman Empire during the 1st century.

The Hidden Ones concluded that the ruler of the Roman Empire, Gaius Julius Caesar Augustus Germanicus, commonly referred to 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 AD, Leonius stabbed Caligula with a dagger in an underground corridor beneath Palatine Hill, killing him.

Between the time of his death and the Renaissance, a tomb dedicated to Leonius had been built beneath Santa Maria della Visitazione. The Assassin Ezio Auditore da Firenze explored Leonius' tomb and took the hidden seal from its sarcophagus, which would help him to later obtain Altaïr Ibn-La'Ahad's armor.



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