(; ; fl. 3rd century AD) was a Greek philosopher
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.