Antonio de Magianis (1443 - unknown) was a member of the Assassin Order and leader of the Thieves Guild located in the Italian city of Venice during the 15th century.

Raised in poverty from birth, Antonio was unable to attain a wealthy lifestyle, eventually resulting in his founding of the Venetian Thieves Guild. Targeting the rich and wealthy of the city's population, Antonio also improved his position in the Assassin Order, realizing that members of the Templar Order had dug their way into Venice's corrupt nobility.

Eventually meeting with Ezio Auditore da Firenze, an Assassin-in-training on a quest for vengeance, the pair worked together to thwart the Templars' plans to take over Venice. After a failed attempt to infiltrate the Palazzo della Seta by the thieves, Ezio eventually managed to do so with their help, resulting in the successful assassination of Emilio Barbarigo. The thieves then took over the Palazzo for themselves, turning it into their new base of operations. (read more...)