In the history of philosophy itself...
In the history of philosophy itself, he was a secondary figure, partly because he did not have the taste or leisure to acquire more than a scrappy knowledge of the 800-year old tradition that preceded him. As a young student at Carthage he developed an ambition, according to his Confessions (397- 400 AD), to lead a philosophical life, which pursued truth.
The opportunity to fulfill this ambition came when at the age of thirty-one; he resumed his childhood Christianity at Milan (386 AD) and gave up his career as a schoolmaster. Aurelius had spent a winter at Cassiciacum by the north Italian lakes with some friends, discussing philosophy, composing dialogues on skepticism, the happy life and soul’s immortality.
When he returned from there to his birthplace -Tagaste in Numidia (Souk -Ahras, Algeria) in 388 AD, he set up a community of young disciples and wrote on the problem of evil, order, prosody, language and learning. However, that life came to an end soon when the Catholic congregation at Hippo on the Numidian coast prevailed on him in 391AD, to become their Presbyter and later a Bishop. From that time onwards, he was never free from pastoral business. He did not stop writing.
His written output - nearly all of which survived, was bulkier than from any other author of ancient times. His subject matter however, became mainly polemical, against the schismatic and heretic. Even his masterpieces - The Confession and City of God (413 - 426 AD), had a pastoral purpose.
The first was a public meditation on his slow journey towards Catholic Christianity, and the second was an attack (which was to have important historical effect) on the pretentious claim of pagans about having a valuable and independent culture. At the end of his life he catalogued and reviewed ninety-three of his works, excluding the numerous sermons and letters, in his collection - Retractions in 426-427 AD (Honderich 2005, p. 66).
Apart from a few years spent in Italy around the 380 AD, he lived his life chiefly in three places: Tagaste, Hippo, and Carthage. His trips elsewhere in North Africa were few and limited.
Although his words traveled widely, his geographical limitations were important to remember, not in the least because they kept him mainly in the more urbanized and coastal north of Africa, away from the high plains and the frontier, away from the districts where a rough form of life and perhaps a more native form of religion held sway (O' Donnell 2006, p. 8).