Olbia or Theodorias was a Roman / Byzantine town between Marj and Bayda in the Cyrenaica region of modern Libya. Olbia is now mostly the 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.
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After destruction by the Vandals and incursions by Laguatan (Lwatae) nomads, it was refounded in 539 CE as Polis Nea Theodorias[1] by the Byzantine empress Theodora.
All that remains of the town are two Byzantine churches. One is integrated into the Qasr, which now houses the Qasr Libya Museum. The other church was excavated by Richard Goodchild in the mid 1950s.[2] Only the floor plan remains, but fifty beautiful mosaic panels depicting the known world and the refoundation and adornment of the city by Theodora are on display in the museum.[3]