Eusebius of Caesarea ca. 263-339
In His [Christ’s] doctrinal teaching, we learn that below the Highest: God there are Powers, by nature unembodied and spiritual, possessing reason and every virtue, a choir around the Almighty, many of whom are sent by the will of the Father even unto men on missions of salvation. We are taught to recognize and honour them according to the measure of their worth, but to render the honour of worship to Almighty God alone. (Demonstratio Evangelica Bk. 3.3)