Looking for a prog-metal song

I'm looking for a song that a friend showed me a long time ago. I used it to make a video, but it got a strike from a copyright infringement , so I'm assuming it's somewhat known. Here's what I can remember:

• It was definitely prog-metal like, pretty long (about 9 minutes) and had an "epic" feeling to it.
• It probably was in Polish. It WAS a foreign language, and I think that was the one.
• It had an unusual title due to being a foreign song, I think it were two long words.
• It sounded somewhat medieval, like it could be sung in a movie about an epic medieval tale.
• As I said, it got a copyright strike, so it must be of a known band.
• I heard it back in 2012-2014, so it can't be anything newer than that.