Relating to or characteristic of the Heraclidae or their descendants; also a noun referring to a member of the Heraclid people.
From Heraclidae (the group) + '-an' (adjective suffix). Emerged in classical scholarship to describe both the mythological and historical aspects of these peoples' culture and invasions.
Archaeologists love studying the Heraclidan period because it bridges mythology and history—we can see the actual cultural changes these invasions brought while also understanding how Greeks mythologized their own past.
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