Ammonius Saccas (; ; fl. 3rd century AD) was a Greek
philosopher from
Alexandria who was often referred to as one of the founders of
Neoplatonism. He is mainly known as the teacher of
Plotinus, whom he taught for eleven years from 232 to 243. He was undoubtedly the biggest influence on Plotinus in his development of
Neoplatonism, although little is known about his own philosophical views. Later
Christian writers stated that Ammonius was a Christian, but it is now generally assumed that there was a different
Ammonius of Alexandria who wrote biblical texts.