Thule is the most northerly location mentioned in ancient Greek and Roman literature and cartography. First written of by the Greek explorer Pytheas of Massalia in about 320 BC, it was often described
Thule as Tile on the Carta marina of 1539 by Olaus Magnus, where it is shown located to the northwest of the Orkney islands, with a "monster, seen in 1537", a whale ("balena"), and an orca nearby