The Ring is a simple retrieval quest and is initiated once you speak with the Desperate Merchant wandering around the Dike. His uncle was wearing a Family Ring when he was killed somewhere in the Swamp and wants you to retrieve it.
Head over to the Swamp and search around behind the Shrine of Melitele in the north-west. There will be many Bloedzuigers around but also a dead body. Search it to find the Family Ring. Bring the ring back to he Merchant for your reward of 100 Orens.