Harrow is a member of the Mythic Dawn who oversees new member inductions. He is also Warden to the Shrine.
During the Main Quest Dagon Shrine he will require the Hero to hand over all of their equipment and Gold to be allowed into the Shrine. He will give the Hero a Mythic Dawn Robe to wear as a temporary replacement.
He can be Pickpocketed shortly after to reclaim any lost gold in this way, as the chances of getting it back are slim once the mission begins.