In Northern mythology Wayland the Smith corresponds to the Roman Vulcan or the Greek Hephaestus; and his name cannot have been attached to the well-known group of sarsen slabs in Berkshire till the Teutonic invaders reached the upper Thames in the fifth century. This cunning worker in metals appears on the Franks casket in the British Museum, dating from soon after 700; and the monument is mentioned under the name of Wayland's Smithy in a charter of King Eadred to Aelfheh dated 955.