The "Angelic Hierarchy" refers to a classification of angels into different orders or choirs, often based on their roles and functions. This concept is most notably outlined in the writings of Dionysius the Areopagite, a Christian theologian from the 5th century. He categorized angels into three triads, each containing three orders: Seraphim, Cherubim, and Thrones in the first triad; Dominions, Virtues, and Powers in the second; and Principalities, Archangels, and Angels in the third.
Each order of angels has specific responsibilities and characteristics. For example, Seraphim are often associated with love and light, while Archangels serve as messengers of God. The hierarchy illustrates the belief in a structured celestial order, where each angelic being plays a unique role in the divine plan and interacts with humanity in various ways