The prehistoric settlements of the area are Koskhoyuk (Kosk Mound) in Nigde, Aksaray Asikli Mound, Nevsehir Civelek cave and, in the southeast, Kultepe, Kanis and Alisar in the environs of Kayseri. This area with unusual topographic characteristics was regarded as sacred and called, in the Scythian/Khatti language, as Khepatukha, meaning "the country of the people of the chief god Hepat", although there are more poetic claims on the origin of the region's name, such as the Old Persian Katpatuka, which allegedly means "the land of beautiful horses". The tablets called Cappadocian Tablets and the Hittite works of art in Alisar are of the important remains dating from 2000s B.C. After 1200s B.C., the Tabal principality, of the Khatti Branches of Scythians, became strong and founded the Kingdom of Tabal. Following the Late Hittite and Persian aras, the Cappadocian Kingdom was established in 332 B.C. During the Roman era the area served as a shelter for the early escaping Christians. There are also several underground cities used by early Christians as hideouts in Cappadocia.