Here is how Gibbon describes him:
He was conscious that his mean and barbarian origin, his savage appearance, and his total ignorance of the arts and institutions of civil life, formed a very unfavorable contrast with the amiable manners of the unhappy Alexander. He remembered that, in his humbler fortune, he had often waited before the doors of the haughty nobles of Rome, and had been denied admittance by the insolence of their slaves. He recollected too the friendship of a few who had relieved his poverty, and assisted his rising hopes. But those who had spurned, and those who had protected, the Thracian, were guilty of the same crime, the knowledge of his original obscurity. For this crime many were put to death; and by the execution of several of his benefactors Maximinus published, in characters of blood, the indelible history of his baseness and ingratitude.