Ammonius Saccas was a third-century Alexandrian teacher traditionally remembered as the master of Plotinus. He left no surviving writings, and the sources preserve little certain detail about his doctrine; his importance lies chiefly in the school and intellectual transition associated with his name. Ancient reports also connect him, more uncertainly, with the Christian Origen.
Ammonius marks the hidden threshold from Middle Platonism to Neoplatonism: the point at which an older philosophical inheritance became a more unified path of contemplation and return. For the Western Mystery Tradition, he represents the power of oral transmission, where a school’s living discipline can shape history even when the teacher’s own words have not survived.