Edit1: Decide to change ‘by’ from Thin Lizzy to the The Dubliners.
As stated by @[email protected], it’s not written by Thin Lizzy but in my view it was the inspiration to the Metallica cover. Even though The Dubliners are ‘credited’, it’s a old tradicional song.
Absolutely, their version is a certified banger. But they didn’t write it.
Also, you’ve got great taste in music