Iamblichus was a prominent philosopher of the Neoplatonic school, active in the 3rd and 4th centuries CE. He is best known for his work on theurgy, a spiritual practice aimed at invoking the divine. His writings emphasized the importance of rituals and the role of intermediaries, such as gods and spirits, in achieving spiritual enlightenment. Born in Chalcis, Iamblichus was a student of Porphyry, another influential Neoplatonist. His most famous work, "On the Mysteries," explores the relationship between the human soul and the divine. Iamblichus' ideas significantly shaped later Neoplatonism and influenced various religious and philosophical traditions.