Icosiel is a demon and a wandering duke of the air. Icosiel has 100 dukes, 300 companions, and many other servants. His 15 chief dukes have 2,200 servants. He and his demons mainly appear in houses. They can be summoned day and night and will do as commanded. The 15 principal dukes are Mchariel, Pischiel, Thanatiel, Zosiel, Agapiel, Larphiel, Amediet, Cambriet, Nathriel, Zachartel, Athesiel, Cumariel, Munefiel, Heresiel, and Ubaniel.