Fathis Ules
From the OblivioWiki – your guide to everything Oblivion
Fathis Ules is the highest ranking fence for the Thieves Guild. You can sell items to him for up to 1500
. He also spends much of his time in Dul gro-Shug's house, but you can not sell stolen goods to him while he is there unfortunately.
You can often find Fathis in or around his home, opposite the King and Queen Tavern, in the Imperial City Elven Gardens District.
Fathis can sometimes be found in Chorrol, particularly in The Oak and Crosier tavern. While in Chorrol he may start the quest Sins of the Father by approaching you after you have completed the quest Legacy Lost.
Sins of the Father requires you to recover a sword stolen from Castle Chorrol. After retrieving the sword you have the option of giving the sword to Fathis for a substantial amount of gold or returning the blade to Castle Chorrol. Should you decide to return the blade to the castle, Fathis will remain in Chorrol and forever shun you, and you will be unable to use him as a fence. However, If you finish the quest by selling him back the sword for 1000, you can then legally buy it back off of him for 1600. It still weighs nothing! This saves weight and as it is ebony, it is a good weapon so you will not need another sword for a long time. Note: If you buy back the sword, you cannot give it back to the castle for the shield.
Note: Fathis' travelling and fence behaviour can be unusual and unpredicatble. He has been known in both the X360 and PC versions to stop offering fence services for no reason, and has also been known to never be in either Chorrol or the Imperial City. The most common, and worst, glitch involves him never leaving Chorrol during the course of Sins of the Father. There are unofficial modifications (mods) available that fix his behaviour. Unofficial modifications are only usable on the PC version; XBox360 owners must wait for an official patch from Bethesda.
If in the Sins of a Father quest you gave the sword back to Fathis then from here on he will tell you that "Our business is done" and leaves the converstaion making it impossible to buy or sell anything from him. this is especially irksome if you are following the thieves guild quests and have him as a fence.
You may also try waiting a few days after going through Redguard Valley Cave, and then asking him about the quest.
