Denys the Areopagite was a Christian theologian and philosopher from the late 5th to early 6th century. He is often associated with the early Christian church in Athens and is believed to have been converted by the Apostle Paul, as mentioned in the New Testament book of Acts. His writings significantly influenced Christian mysticism and theology. He is best known for his works on the nature of God and the celestial hierarchy, including "The Divine Names" and "The Mystical Theology." Denys's ideas were later integrated into the teachings of notable theologians like Thomas Aquinas and had a lasting impact on both Christian and Islamic thought.