羅馬元老院
In 38 Rhoemetalces III became Roman Client King of Thrace and had married Cotys’ sister Pythodoris II. Also in 38 the Roman Emperor Caligula with the agreement of the Roman Senate, appointed Cotys as Roman Client King of Lesser Armenia. Caligula and the Roman Senate gave him a part of the Lesser Armenian Kingdom and some parts of Arabia to rule. These parts of Arabia later became the Roman province of Arabia Petraea.