Wasn't the Dark Brotherhood Sanctuary of Oblivion in Leyawiin? Or Cheydinhal? I can't remember. I don't remember there being one in Bravil, though.

Cheydinhal. Apparently there were sanctuaries across Cyrodiil, but we never saw them. No need, really. And I dare say we never will, considering the events which took place during the Great War.

_{Cheydinhal was the location of the Santuary. Bravil was where the Night Mother's crypt was located.}

yea there were many sanctuary's in Cyrodiil, the Cheydinhal Sanctuary was the only home for the player. Though most of them now are destroyed and iirc dawnstar sanctuary is pretty old, maybe older than the other Sanctuary's.

This. Also, I love how it's been years since playing that game but I still know this. Kind of like how I can still get through the Dark Cave in Pokemon Red without using Flash because I didn't know about Flash on my first time playing through.

Spoiler... there are two sanctuaries in Skyrim.

Not sure how this is relevant considering the OP was talking about cyrodiil's sanctuary's.