Analysis of information sources in references of the Wikipedia article "Kaymakli Underground City" in English language version.
None the less, at the beginning of the 20th century, Greek still had a strong presence in Silli north-west of Konya (ancient Ikonion), in Pharasa and other villages in the region drained by the Yenice river (some 100km south of Kayeri, ancient Caesarea), and in Cappadocia proper, at Arabison (Arapsu/Gulsehir) northwest of Nevşehir (ancient Nyssa), and in the large region south of Nevşehir as far down as Nigde and Bor (close to ancient Tyana). This whole area, as the home of St Basil the Great (329–379), his brother St Gregory of Nyssa (335–394) and his friend St Gregory of Nazianzos (330–389), was of great importance in the early history of Christianity, but is perhaps most famous today for the extraordinary landscape of eroded volcanic tufa in the valleys of Goreme, Ihlara and Soganh, and for the churches and houses carved into the 'fairy chimneys' to serve the Christian population in the middle ages. Many of the rock-cut churches, which range in date from the 6th to the 13th centuries, contain magnificent frescos. Away from the valleys, some of the villages have vast underground complexes containing houses, cellars, stables, refectories, cemeteries and churches, affording protection from marauding Arabs in the days when the Byzantine empire extended to the Euphrates, and serving later as places of refuge from hostile Turkish raiders. The most famous of these are at Kaymakli and Derinkuyu, formerly the Greek villages of Anaku (Inegi) and Malakopi (Melagob), where the chambers extended down over several levels of depths of up to 85 metres.
... these excavations are referred to as long ago as the campaigns of Timour Beg, one of whose captains was sent to hunt out the inhabitants of Kaisariyeh, who had taken refuge in their underground dwellings, and was killed by an arrow shot through the hole in one of the doors.
... their use as places of refuge in time of danger is indicated by their name καταφύγια, and when the news came of the recent massacres at Adana [in 1909], a great part of the population at Axo took refuge in these underground chambers, and for some nights did not venture to sleep above ground.
