The discovery of the Pellumbas Cave near Tirana shows that ancient human culture was present in Albania as early as the Paleolithic era. The region that today corresponds to the city's territory has been continuously inhabited since the Iron Age. The area was inhabited by Illyrians, and was most likely the core of the Illyrian kingdom of the Taulantii, which in Classical antiquity was centered in the hinterland of Epidamnus. The oldest discovery within the urban area of Tirana was a Roman house, which was transformed into an aisleless church with a mosaic floor, dating to the 3rd century, with other remains found near a medieval temple at Shengjin Fountain in the eastern suburbs. A castle possibly called ''Tirkan'', whose remnants are found along Murat Toptani Street, was built by Byzantine Emperor Justinian I and restored by Ahmed Pasha Toptani in the 18th century.