Amphilochius of Iconium was a fourth-century Christian bishop and writer born into a distinguished Cappadocian family. A contemporary of Basil the Great and Gregory of Nazianzus, he was educated in law at Antioch before dedicating himself to religious life. He served as the bishop of Iconium, a position he likely attained through the influence of Basil. He is noted in theological history for defending the divinity of the Holy Spirit and for his contributions to Trinitarian thought, utilizing specific terminology regarding the modes of being.