Like an empty time capsule in tattooed tartan pajamas
I had not realized until tonight how early exposure to The Blues Brothers (1980) teaches a person to recognize Nazi dogwhistles, but I was linked to this article about a pseudo-Celtic fascist-prop TV series in attempted development and as soon as I read that "our present filmmaker froths about the Globalist Multicultural Romans bringing African soldiers over to oppress the Britons," I heard Henry Gibson through a bullhorn: "White men, white women, the swastika is calling you . . . The Jew is using the Black as muscle against you." Illinois Nazis.

no subject
Thus demonstrating a buy-one-get-one-free willful ignorance of both history and theater. Of course someone did.
If you want a non-Nazi Celtic-esque mash-up, I recommend Roar, where recommend mostly means I wanted Heath Ledger's hair. I kinda still do
I don't think I even knew this show existed!
Much more recently, I have heard fun things about Britannia (2018–).