He then goes to Rome, and undertakes to plead the cause of Deiotarus, the King of Galatia, before Caesar. This very old man had years ago become allied with Pompey, and, as far as we can judge, been singularly true to his idea of Roman power. He had seen Pompey in all his glory when Pompey had come to fight Mithridates. The Tetrarchs in Asia Minor, of whom this Deiotarus was one, had a hard part to play when the Romans came among them. They were forced to comply, either with their natural tendency to resist their oppressors, or else were obliged to fleece their subjects in order to satisfy the cupidity of the invaders. We remember Ariobarzanes, who sent his subjects in gangs to Rome to be sold as slaves in order to pay Pompey the interest on his debt. Deiotarus had similarly found his best protection in being loyal to Pompey, and had in return been made King of Armenia by a decree of the Roman Senate. He joined Pompey at the Pharsalus, and, when the battle was over, returned to his own country to look for further forces wherewith to aid the Republic. Unfortunately for him, Caesar was the conqueror, and Deiotarus found himself obliged to assist the conqueror with his troops. Caesar seems never to have forgiven him his friendship for Pompey. He was not a Roman, and was unworthy of forgiveness. Caesar took away from him the kingdom of Armenia, but left him still titular King of Galatia. But this enmity was known in the king's own court, and among his own family. His own daughter's son, one Castor, became desirous of ruining his grandfather, and brought a charge against the king. Caesar had been the king's compelled guest in his journey in quest of Pharnaces, and had passed quickly on. Now, when the war was over and Caesar had returned from his five conquered nations, Castor came forward with his accusation. Deiotarus, according to his grandson, had endeavored to murder Caesar while Caesar was staying with him. At this distance of time and place we cannot presume to know accurately what the circumstances were; but it appears to have been below the dignity of Caesar to listen to such a charge. He did do so, however, and heard more than one speech on the subject delivered in favor of the accused. Brutus spoke on behalf of the aged king, and spoke in vain. Cicero did not speak in vain, for Caesar decided that he would pronounce no verdict till he had himself been again in the East, and had there made further inquiries. He never returned to the East; but the old king lived to fight once more, and again on the losing side. He was true to the party he had taken, and ranged himself with Brutus and Cassius at the field of Philippi.