Plotinus (/plɒˈtaɪnəs/; Greek: Πλωτῖνος; c. 204/5 – 270) was a major philosopher of the ancient world. In his philosophy there are three principles: the One, the Intellect, and the Soul. His teacher was Ammonius Saccas and he is of the Platonic tradition. Historians of the 19th century invented the term Neoplatonism and applied it to him and his philosophy which was influential in Late Antiquity.