Ammonius, surnamed SACCAS ('sack-carrier'), a Greek philosopher, founder of the Neo-Platonic School, is said to have been in his earlier days a porter in Alexandria, whence his surname. His parents were Christian, but he himself is said by Plotinus to have abandoned his early religion; although both Eusebius and St Jerome deny his apostasy. He opened a school of philosophy in Alexandria, and sought to harmonise, through a comprehensive eclecticism, the philosophies of Aristotle and Plato. He seems also to have added elements of oriental speculation; but it is doubtful how far Neo-Platonism represents his own position. His most distinguished pupils were Origen and Plotinus. Ammonius Saccas died at Alexandria, 243 A.D., at the age of more than eighty. He left no writings behind him.
AMMONIUS was also the name of a Peripatetic philosopher of the 1st century, the instructor of Plutarch; of a Christian philosopher of the 3d century, who wrote a 'Harmony of the Gospels'; of a philosopher of the 5th century, a disciple of Proclus, who left important commentaries on Aristotle; and of an Alexandrian grammarian of the 4th century.