d0553e13_ations___Assassin_s_Creed_Wiki__Description
[Artefact] Ring [Hint 1] An Artefact is located in a Sewer. [Hint 2] The Sewer is by the water. [Hint 3] The Sewer is next to a Church. [Reward] Video - "Multiplayer gameplay" [Description] 
Bits of wax indicate that this ring served as a seal, doubtless for an important member of the Order.
Assassin's Creed: Revelations - Path to Revelations - Assassin's Creed Wiki
Description