Claudius Maximus was a Stoic

STOIC

STOIC was a variant of Forth.It started out at the MIT and Harvard Biomedical Engineering Centre in Boston, and was written in the mid 1970s by Jonathan Sachs...

 philosopher and a teacher of Marcus Aurelius.

Marcus describes him as the perfect sage:

From Maximus I learned self-government, and not to be led aside by anything; and cheerfulness in all circumstances, as well as in illness; and a just admixture in the moral character of sweetness and dignity, and to do what was set before me without complaining. I observed that everybody believed that he thought as he spoke, and that in all that he did he never had any bad intention; and he never showed amazement and surprise, and was never in a hurry, and never put off doing a thing, nor was perplexed nor dejected, nor did he ever laugh to disguise his vexation, nor, on the other hand, was he ever passionate or suspicious. He was accustomed to do acts of beneficence, and was ready to forgive, and was free from all falsehood; and he presented the appearance of a man who could not be diverted from right, rather than of a man who had been improved. I observed, too, that no man could ever think that he was despised by Maximus, or ever venture to think himself a better man. He had also the art of being humorous in an agreeable way.

Marcus also mentions his death and that of his wife Secunda.

He may be the Claudius Maximus who was the proconsul

Proconsul

A proconsul was a governor of a province in the Roman Republic appointed for one year by the senate. In modern usage, the title has been used for a person from one country ruling another country or bluntly interfering in another country's internal affairs.-Ancient Rome:In the Roman Republic, a...

 of Africa

Africa Province

The Roman province of Africa was established after the Romans defeated Carthage in the Third Punic War. It roughly comprised the territory of present-day northern Tunisia, and the small Mediterranean coast of modern-day western Libya along the Syrtis Minor...

 before whom Apuleius

Apuleius

Apuleius was a Latin prose writer. He was a Berber, from Madaurus . He studied Platonist philosophy in Athens; travelled to Italy, Asia Minor and Egypt; and was an initiate in several cults or mysteries. The most famous incident in his life was when he was accused of using magic to gain the...

delivered a defence against a charge of magic (c. 158 AD) in which he calls him a most religious man.