User blog comment:D. Cello/Assassinews 10/19 -- ACR new info/@comment-92.24.61.248-20111022092813/@comment-3096856-20111024135717

I think that the Il Mentore title is an Assassin, I think a Master Assassin, that has took up a number of Apprentices. The Grand Master may be an Assassin that practically runs the whole Order. So the Grand Master is most likely a higher rank/title than Il Mentore.