Sycae (Greek: ãàúñï), later known as Justinianae (ÃÂÿàÃÂÃÂùýùìýñù) and Justinianopolis (ÃÂÿàÃÂÃÂùýùñýÿÃÂÃÂÿûùÃÂ), was a town of ancient Thrace, a suburb of Byzantium-Constantinople, that was inhabited during the Roman and Byzantine empires.
Its site is located near the neighborhood of Galata in Karaköy, East Thrace (European Turkey).