What is "deiotarus"

Deiotarus of Galatia (in Galatian and Greek Deiotaros, surnamed Philoromaios; ca 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.

The name Deiotarus is understood as deio-tauros or "divine bull".