You won't meet all of the Daedric Princes. In fact, you'll only get to see one of them; Mehrunes Dagon. Also, you'll be traveling to just a few different realms of Oblivion. All of the Oblivion gates that can be found around the world lead to Dagon's realm. During the mainquest you'll get to visit a realm forged by Camoran, a mere mortal. However, his realm might just be a part of Dagon's realm. Also, during a few of the Daedric shrines quest you'll be visiting parts of Oblivion that may belong to the other Princes.
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