Markos (Cypriot)

Markos was a member of Cypriot resistance against the Knights Templar, who aided Altaïr while he was dealing with Templars in Kyrenia. It is possible he took over the role of Barnabas after his death, as he was seen behind Barnabas' desk a couple of times.

Trivia
Markos looks similar to a vigilante model from the first Assassin's Creed.