Hi ! I finished the Staff of Magnus quest in Labyrinthian, but was unable to find the Ancient Nordic Helmet of the Unburned. I need it for my next quest, I would like to go back to Labyrinthian to find it, but exactly where will I look?

Labyrinthian is such a vast tomb with so many twists and turns, I'm afraid I will miss it's location once again. Btw, I read it is behind a locked gate, is the lock expert? I would like to know to prepare for it, am not very good at locks so I have to go to that stone somewhere to get that Lockpicking power. Thanks for your help!

https://www.youtube.com/watch?v=7qA0GtfPfvM It will be sitting on top of a Greatsword, which is sticking out of the brazier.

OK I got it. Watched the video. It's after the word wall, through the hallway, before the exit. I skipped that part on my way out before, I didn't know something was of consequence there. Thanks so much for the help!