The Salamis Marble Quarry was an Athenian quarry located on the island of Salamis, Greece during the 5th century BC. The quarry was owned by the family of Brison, a member of the Delian League branch of the Cult of Kosmos, and, in 431 BC, Kassandra assassinated Brison at the quarry. She also killed all of the Cultists there and looted their treasures.