Hero cults were one of the most distinctive features of ancient Greek religion. In Homeric Greek, "hero" (, hḗrōs) refers to a man who was fighting on either side during the Trojan War. By the historical period, however, the word came to mean specifically a dead man, venerated and propitiated at his tomb or at a designated shrine, because his fame during life or unusual manner of death gave him power to support and protect the living. A hero was more than human but less than a god, and various kinds of supernatural figures came to be assimilated to the class of heroes; the distinction between a hero and a god was less than certain, especially in the case of Heracles, the most prominent, but atypical hero.
The grand ruins and tumuli remaining from the Bronze Age gave the pre-literate Greeks of the 10th and 9th centuries BC a sense of a grand and vanished age that was reflected in the oral epic tradition, which would be crystallized in the Iliad. Copious renewed offerings begin to be represented, after a hiatus, at sites like Lefkandi, even though the names of the grandly buried dead were hardly remembered. "Stories began to be told to individuate the persons who were now believed to be buried in these old and imposing sites," observes Robin Lane Fox.
Greek hero-cults were distinct from the clan-based ancestor worship from which they developed, in that as the polis evolved, they became a civic rather than familial affair, and in many cases none of the worshipers traced their descent back to the hero any longer: no shrine to a hero can be traced unbroken from Mycenaean times. Whereas the ancestor was purely local, Lewis Farnell observed, the hero might be tended in more than one locality, and he deduced that hero-cult was more deeply influenced from the epic tradition, that "suggested many a name to forgotten graves", and provided even Dorians a connection to Mycenaean heroes, according to Coldstream. "Coldstream believed the currency of epic would account for votives in Dorian areas, where an alien, immigrant population might otherwise be expected to show no particular reverence for Mycenaean predecessors". Large Mycenaean tholos tombs that betokened a grander past, were often the site of hero-cults. Not all heroes were even known by names.