Okay lol this source had me chuckling a bit. We’ve got a direct quote here:
“For example, here is the Pumhart mortar made in Styria at the beginning of the 820th century.”
I did not know we were already aware of weaponry used millennia after the events of Warhammer 40k lol.
Haha I love it, just took me aback.
Edit: When cross referencing with Wikipedia, I’m wondering if they were trying to describe the calibre as apparently it’s 800mm/31inches.