The Samothrace Temple Complex, known as the Sanctuary of the Great Gods (Modern Greek: Ιερό των Μεγάλων Θεών Ieró ton Megalón Theón), is one of the principal Pan-Hellenic religious sanctuaries, located on the island of Samothrace within the larger Thrace. Built immediately to the west of the ramparts of the city of Samothrace, it was nonetheless independent, as attested to by the dispatch of city ambassadors during festivals.
It was celebrated throughout Ancient Greece for its Mystery religion, a Chthonic religious practice as renowned as the Eleusinian Mysteries. Numerous famous people were initiates, including the historian Herodotus – one of very few authors to have left behind a few clues to the nature of the mysteries, the Spartan leader Lysander, and numerous Athenians. The temple complex is mentioned by Plato and Aristophanes.
During the Hellenistic period, after the investiture of Phillip II, it formed a Macedonian national sanctuary where the successors to Alexander the Great vied to outdo each other's . It remained an important religious site throughout the Roman period. Hadrian visited, and Varro described the mysteries – before fading from history towards the end of Late Antiquity.
The identity and nature of the deities venerated at the sanctuary remains largely enigmatic, in large part because it was taboo to pronounce their names. Literary sources from antiquity refer to them under the collective name of "Cabeiri" (Greek: Κάβειροι Kábeiroi), while they carry the simpler epithet of Gods or Great Gods, which was a title or state of being rather than the actual name, (Μεγάλοι Θεοί Megáli Theí) on inscriptions found on the site.