Greek mythology to dominance is frequently called the "Dorian invasion". The Lydian and later the Macedonian kings, as rulers of the same rank, also became Heracleidae. Other members of this earliest generation of heroes such as Perseus, Deucalion, Theseus and Bellerophon, have many traits in common with Heracles. Like him, their exploits are solitary, fantastic and border on fairy tale, as they slay monsters such as the Chimera and Medusa. Bellerophon's adventures are commonplace types, similar to the adventures of Heracles and Theseus. Sending a hero to his presumed death is also a recurrent theme of this early heroic tradition, used in
Paleoart a Corinthian vase painted sometime between 560 and 540 BCE is thought by some researchers to bear a depiction of an observed fossil skull. This so-called "Monster of Troy", the beast fought by the mythological Greek hero Heracles, somewhat resembles the skull of the giraffid "Samotherium". Witton considered that because the painting has significant differences from the skull it is supposedly representing (lack of horns, sharp teeth) the evidence is lacking that it represents "proto-paleoart". Other scholars have suggested that ancient fossils inspired Grecian depictions of griffins, with the mythical chimera of lion and bird anatomy superficially resembling the beak,