User blog comment:Loganh/I just started playing Oblivion and would like tips on important things such as the guilds./@comment-3012085-20101006032347

The Fighter's and Mage's Guilds are in every city, except the Imperial City but The Arcane Univercity is there. The Arena is in the Imperial city, the Dark Brotherhood is in Cheydinhal while the the Thieve's Guild isn't based anywhere but a bit in the waterfrount district of the Imperial City.