What was the name of the area in the highlands of central Anatolia ruled by Deiotarus?
Deiotarus Deiotarus of Galatia (in Galatian and Greek Deiotaros, surnamed Philoromaios;  105 BC 42 BC, 41 BC or 40 BC) was a Chief Tetrarch of the Tolistobogii in western Galatia, Asia Minor, and a King of Galatia ("Gallo-Graecia"). He was considered one of the most adept of Celtic kings, ruling the three tribes of Celtic Galatia from his fortress in Blucium.
Caucones The Caucones (Greek: Καύκωνες , "Kaukones") were an autochthonous tribe of Anatolia (modern-day Turkey) whose migrations brought them to the western Greek mainland in Arkadia, Triphylian Pylos, and north into Elis. Their etymology suggests strong affinities with the Caucasos Mountains originally. Russian KAVKAZ for Caucasus is attached to the two mountain ranges that serve as a ‘spine’ or backbone between the northern and southern regions dividing Europe from Asia. Kaz-Kaz people known from the written Hittite tablets, indeed, lived along the southern shore of the Black Sea, exactly where the Homeric "Iliad" placed the Kaukônes.1 According to Herodotus and other classical writers, they were displaced or absorbed by the immigrant Bithynians, who were a group of clans from Thrace that spoke an Indo-European language. Thracian Bithynians also expelled or subdued the Mysians, and some minor tribes, the Mariandyni alone maintaining themselves in cultural independence, in the northeast of what became Bithynia. Strabo (12.3.3) acknowledges that in earlier times Bithynians were called Mysians who, in turn, Herodotus (7.20, 75) says alongside Teucrians were invaders of northern Greece (Thessaly) before the Trojan War.