Hercules' Club Donarkeule Pendant Replica of a 5th century original artefact. Hercules' Club (also Herkuleskeule or Donarkeule) is a Roman Empire and Migration era bone pendant, the examples were crafted between the 2nd to 3rd century CE. A pendant found in Köln-Nippes, Germany, bears the inscription DEO HER(culi), confirming the association with Hercules. Tacitus mentions a special affinity of the Germans for Hercules, stating: they say that Hercules, too, once visited them; and when going into battle, they sing of him first of all heroes.
During the Germanic migration the amulet rapidly spread from the Elbe Germanic area across Europe. These Germanic Donar's Clubs were made from deer antler, bone or wood. The amulet type was later replaced by the Viking Age Thor's hammer pendants.