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Tarik Barleti
Tarik was the Captain of the Janissaries. He was very distrustful of Ahmet, Suleiman's uncle. Tarik saw Ahmet not fit to lead, much to Ahmet's anger. It is also implied that Tarik ordered an assassination attempt on Suleiman to make Ahmet look weak, Ezio was about to follow up on this, however a stalker stabbed him in the back, distracting and wounding him.
Source
http://www.gamesradar.com/assassins-creed-revelations-preview-hands-single-player-story/?page=2]