William Miles

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William M. is a member of the Assassin Order, who acted as a contact for the Assassin teams spread throughout the world. He regularly kept the teams informed about the situation of the others.

For the Assassin team in Italy, he mainly relayed information through Shaun Hastings and requested him to forward it to the other members. He also had a conversation with Lucy Stillman about the condition of Desmond Miles, who had been suffering from the bleeding effect, in which he said that they had to keep going, as they needed the location of the Apple of Eden.

William M. may be Bill Miles from Assassin's Creed: The Fall, although this remains to be proven.

Source

 * Assassin's Creed: Brotherhood