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Leonardo helps defend Otranto from an Ottoman attack on Da Vinci's Demons Season 3 Episode 1. However, he soon realizes the Turks are using his military designs on the battlefield. Who betrayed Leo by stealing his inventions?
On the season 2 finale of Da Vinci's Demons, Leonardo is forced back into the role of war engineer as the Ottoman Empire attacks Italy. Lorenzo, Alfonso and Sixtus form an uneasy alliance to fight the invaders. In the final moments of the episode, Leo makes a discovery that will affect his quest moving forward.
On Da Vinci's Demons, Leo and Verrocchio decipher the brazen head's hidden message but at a terrible cost. Riario's redemption doesn't go according to plan and neither do Lorenzo's negotiations with King Ferrante of Naples.
Leonardo faces one last mystery in the New World before heading home to Florence. Mad King Ferrante of Naples finally meets with Lorenzo, but is it too little too late? Lucrezia plans go very poorly on Da Vinci's Demons.
While searching for the Book of Leaves, Leonardo and his allies must deal with death at every turn on Da Vinci's Demons.
Leonardo and Riario must pass a series of tests before entering The Vault of Heaven and their fates are entwined. Lorenzo's fate is in the hands of a mad King on Da Vinci's Demons.
Leonardo and his friends finally reach the new world. They are captured by the Inca and forced to take part in a deadly ritual. Elsewhere, Lorenzo meets with Mad King Ferrante of Naples on Da Vinci's Demons.
Leonardo solves the mystery of the solar system and plots a course to the New World. Lucrezia's reunited with her father and Lorenzo's road trip is interrupted on Da Vinci's Demons.
Leonardo faces off against ambidextrous swordsman Duke Alfonso of Naples in an attempt to steal his ship. He also builds a submarine! Pope Sixtus excommunicates Florence forcing Lorenzo's hand, while Lucrezia tells Lupo Mercuri to go see “the Prisoner.” The man’s identity will prompt him to reassess his position.
Leonardo invents a crude amplification system allowing Lorenzo to speak to his people. The Pazzi traitors are hung for their crimes.