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Constantinople Assassins Guild
The Assassin's Guild in Constantinople was created by Niccolò Polo and Maffeo Polo by the request of the Grand Master of the Assassin Order, Altaïr Ibn-La'Ahad, in order to hide his Codex and his Seals subsequent to the Fall of Masyaf to Mongolian forces. Master Assassin Yusuf Tazim is the leader of the Guild during the Renaissance and during the Ottomans.
Source:
Assassin's Creed: The Secret Crusade