Claim: Brontinus was a Pythagorean philosopher whom some Orphic poems were ascribed to, among those poems is "On Nature (Physika)", and whose fame was sufficient for a spurious work to be ascribed to him in Neopythagorean literature.
Evidence: Brontinus of Metapontum (Greek: Βροντῖνος, also Brotinus, Βροτῖνος; fl. 6th century BCE) was a Pythagorean philosopher, and a friend and disciple of Pythagoras himself. One was a poem On Nature (Physika), another was a poem called The Robe and the Net which was also ascribed to Zopyrus of Heraclea. Some Orphic poems were ascribed to Brontinus. His fame was sufficient for a spurious work to be ascribed to him in the Neopythagorean literature.