The Thieves Guild is an organization of Pickpockets, Burglars, Robbers, and Thieves. Founded by the Gray Fox over 300 years before the Oblivion Crisis, the Guild is essentially a network of communication between the Thieves of Cyrodiil, tips on loot and jobs from important people are passed along through the Doyen to the Thieves, and Fences will buy their stolen goods, unlike most merchants.