 Her work led to the identification of five chronological periods of urbanization on the peninsula surrounding Nesebar through the end of the second millennium BCE, which included the Thracian protopolis, the Greek colony Mesambria, a Roman-ruled village to the Early Christian Era, the Medieval settlement and a Renaissance era town, known as Mesemvria or Nessebar.Remains date mostly from the Hellenistic period and include the acropolis, a temple of Apollo and an agora.A wall which formed part of the Thracian fortifications can still be seen on the north side of the peninsula.