Ancient Helmet of the Unburned

The Ancient Helmet of the Unburned is a heavy armor helmet located in Labyrinthian. When worn, it provides a 40% resistance to fire damage. It's apperance is the same as the Ancient Nord Helmet and it can be improved with an iron ingot.

Location
You can find it in a corner behind a locked gate in the Labyrinthian Tribune, during The Staff of Magnus.