Olbia, Libya

Olbia or Theodorias (Ancient Greek: Ὀλβία, Θεοδωριάς) was a Roman / Byzantine town between Marj and Bayda in the Cyrenaica region of modern Libya. Olbia is now mostly an archaeological site. The location's modern name is Qasr Libya, after the Islamic period castle (qasr) on the site and Libya or Lebia as a corruption of the ancient name Olbia.