Born into a moderately successful family in the region of Thesprotia, as a boy Clearchus was taught by the philosopher and sophist Nicoles.
From 359 Clearchus held a number of unknown posts in Constantinople, and was promoted in 360 to a higher position.
[2] His increasing political clout was demonstrated by his inclusion in the embassy from the Senate to Antioch to greet the new emperor Jovian after his accession.
During the revolt of Procopius, he remained loyal to the emperor Valens, and risked his life in support of him.
[7] He was also able to protect the philosopher Maximus of Ephesus, who had been convicted of illegally enriching himself, by releasing him and restoring his property.