Rufio

Rufio is an elderly man found in the Inn of Ill Omen and also a retired member of the mythic dawn. You must kill him to complete "A Knife in the Dark" quest for the Dark Brotherhood. To find him go to the Inn of Ill Omen and talk to the proprietor Manheim Maulhand, to find that Rufio is living downstairs in the Private Quarters. To reach him go back to the door and turn right and head through the small trap door in the floor. The door is unlocked and he is most likely asleep as since he sleeps 20 hours a day. From 2am to 6am he wanders the Inn.