Koveras's Ring of Protection

On the second level of Candlekeep Library you're greeted by a strange figure named Koveras, he says he used to work for Gorion, and is very eager to help you by giving you his ring, he seems to know a little too much of the details of Gorion's passing...

This ring is one of the possible importables into Shadows of Amn campaign, and can be found a room north of the three dryads on Irenicus's Dungeon 1st Floor should you choose to do so, however, it doesn't have any special function beyond being a normal Ring of the Princes.

In-game description
"Ring of Protection +1: Ring of the Princes This ring and several of its type were originally crafted to protect the sons of King Castter De'wess, though who uttered the enchantment is unknown. History records that the rings remained within that family for at least thirteen generations, though they were all apparently lost within the space of one. Enmity between the king and the family of the creator may be to blame."