Actually, there were five: Periphetes, Cercyon, Procrustes, Sciron, and Sinis.

The Palici; The Cabeiri; Erichthonius, Periphetes, Ardalus, Cercyon (possibly), Olenus, Palaemonius (a Argonaut), Philottus, Pylius and Spinter.

Eucleia, Euthenia, Eupheme, Philophrosyne; The Palici; The Cabeiri; Erichthonius, Periphetes, Ardalus, Cercyon (possibly), Olenus, Palaemonius (a Argonaut), Philottus, Pylius and Spinter.

Theseus killed the bandit, the "clubber"Periphetes, who beat his opponents into the Earth, and took from him the stout staff that often identifies Theseus in vase-paintings.

Eucleia, Euthenia, Eupheme, Philophrosyne; The Palici; The Cabeiri; Erichthonius, Periphetes, Ardalus, Cercyon (possibly), Olenus, Palaemonius (a Argonaut), Philottus, Pylius and Spinter.