A heroön or heroon (plural heroa) (hᵻˈroʊ.ɒn ἡρῷον, pl. ἡρῷα), also latinized as heroum, is a shrine dedicated to an ancient Greek or Roman hero and used for the commemoration or cult worship of the hero. They were often erected over his or her supposed tomb or cenotaph. They were erected from the time of archaic Greece to the Augustan Roman period, and as far afield as Ai-Khanoum in Afghanistan. The Romans and the Greeks practised an extensive and widespread cult of heroes. Heroes played a central role in the life of a polis, giving the city a shared focus for its identity. The cult typically centred on the heroön in which the hero's bones were usually believed to be contained. In a sense, the hero was considered still to be alive; he was offered meals and was imagined to be sharing feasts. His allegiance was seen as vitally important to the continued well-being of the city. This led to struggles between Greek cities for control of heroic remains. Greek literature records how Cimon of Athens avenged the death of the legendary hero Theseus in 469 BC, finding a set of bones allegedly belonging to the hero and returning with them in triumph to Athens. Similarly, Herodotus records in his Histories that the Spartans raided the heroön of the city of Tegea, stealing the bones of Orestes. This was regarded as changing the hero's allegiance from Tegea to Sparta, ensuring that the Spartans could defeat the Tegeans as foretold by the Oracle of Delphi. (For an analogous practice in ancient Rome, see evocatio). Many examples of heroa can be found around the tholos tombs of Mycenaean Greece and in or near the sacred areas of a number of Greek cities around the Mediterranean. A particularly well-preserved example, the so-called Tomb of Theron, can be found at Agrigento in Sicily. The Greek city of Paestum, south of Naples, has an unlooted heroon of an unknown figure, perhaps the city founder, with its contents intact (now in the museum there), including large metal vases.