Rogash's Manor

Rogash's Manor is large building in Rogash's Garden on first island of Exodor. There's Tended Garden in front of the building and numerous Naga Knights guarding it.

Oddly, it's marked as "Rogash's Manor" on map, but shown as "Rogash's Sanctuary" in compass when you go there. Story quest instance Inside Rogash's Sanctuary  happens inside the building.