Name of a Metal Band?

I'm not sure if "Alestorm" is the band you're looking for, but when you mentioned an album depicting a hero and swords i thought of their album cover for "Black Sails at Midnight" (although i do know that the character(s) is/are pirates lol). A track on that album, "Pirate Song", has the lyrics, "...I once had the heart of a lion..." and the fact that the band fits into the genre you described has me thinking they're what you looking for. But again, i really don't know (: hope i helped anyway.