glaucetas, or glauketas (; flourished 315–300 bc), was a greek pirate mostly active in the aegean sea during the 4th century bc. little is known about his life. glaucetas is mentioned in ancient greek inscriptions, or stone markings, describing how the navy of athens led by thymochares attacked his base on the island of kythnos. in the end, the athenian navy removed glaucetas from kynthos thus "making the sea safe for those that sailed thereon."