Proclus was a prominent Greek philosopher who lived during the 5th century CE. He is best known for his work in the Neoplatonic tradition, which sought to synthesize the ideas of Plato with various religious and mystical elements. Proclus served as the head of the Platonic Academy in Athens and wrote extensively on topics such as metaphysics, theology, and the nature of the divine. His most significant contributions include commentaries on Plato's dialogues and original works like "Elements of Theology." Proclus emphasized the importance of the One, or the ultimate source of all existence, and developed a complex hierarchy of being. His ideas influenced later philosophers and the development of Christian thought.