So as it turns out, the Tizona from the old-gen console versions of Terraria is a real sword. It looks VERY, VERY different from its Terraria counterpart.
Tizona sprite from Terraria Tizona image from Wikipedia Excalibur is also supposedly a real sword, however the only evidence of its existence is Richard the Lionheart giving a sword to his ally Tancred, King of Sicily.
