Telendos

The ancient Greeks called it Kelleris and it was included in the "islands of Kalidna", mentioned in Homer's "New Catalog", along with the rest in the region of Kalymnos. In antiquity, it probably belonged to the Kalymnian municipality of Panormos. Remnants of the late-Roman period, such as baths (hot springs), olive presses, are found mainly on the east coast of the island, among the large Early Christian basilicas, near the present settlement. To the west of the place "Tholaria" or "Pefki" with the above ground tombs, is the place of the ancient theater.

At the imposing and steep hill of St. Constantine with the fortified Byzantine settlement, located on the north slope and about the middle of "Rachi", at an altitude of about 120 meters, there are remains of a guard. In the coastal location "Vlychada", remains of a post-Roman pottery workshop were preserved. The castle is estimated to have been built in the second half of the 7th century to protect the settlement from the Arab invasions of the time and probably, after the earthquake of 535, was abandoned. In the 15th century, the Florentine monk - geographer Cristoforo Buondelmonti visited the island, hosted by the Knights of St. John and recorded its Christian monuments.