Erevan is a former member of the Order of the Rose, a group of knights descended from the Knights of the Thorn. Founded during the Oblivion Crisis, the Knights of the Thorn were led by Farwil Indarys, son of the Count of Cheydinhal. Over the centuries, Erevan tells of how the Order became more structured, benevolent, and pure, taking the rose as its sigil as opposed to its thorny stem. However, that ideal was stained when Erevan was accused of assaulting the Countess, and now lives out his days in exile as a drunken rube.

A Rose Without Thorns
After meeting Delphine in Riverwood for the quest Diplomatic Immunity, the quest will be active the moment you speak to Erevan, provided you had not spoken to him previously. Returning to the inn a second time will enable Hiram, a member of the Order of the Rose sent to check on his former commander.  The quest makes several references to the Knights of the Thorn, from Hiram and Erevan’s race and armor to the use of the term Huzzah.