Order of Malta ranks:

Army:
-Lower Ranks:
Pilgrim
Levy
-Medium Rank
squire
High Ranks:
Noble
Knight or dismounted Knight
Commander ranks:
Feudal lord
Field Marshal

Navy:
Lower rank:Seaman
Medium rank:Veteran Gunner
Commander rank:Commander of the navy

Members and Ranks:
Me=Grand Master
Templar Grand Master Kenway=Field Marshal.