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But behind every judge and prince is an angel, a throne, authority, a power. It has double meaning - both angel and human. Both either are allied against God, or for God. The unjust princes were usurped by evil spirits, and both the princes and spirits (powers, authorities) were destroyed. See Genesis 6, Jude 1:6, 2 Peter 2, etc. It has a widespread use in scripture.

See also, with Peter at the gate, "It is his angel", and "Receive the saints for you will entertain angels unawares" and "A man, that is an angel" in Rev 21.

The Angel in Revelation 1:20 has also been called the Spirit. "Blessed are those who hear what the Spirit (Angel) is speaking to the churches". Jesus speaks to the Angel of the church, which is a ministering spirit, which then speaks to the church. The angel is a messenger. That's why there are seven churches, seven angels who stand before the throne, and seven spirits (lamps of fire) burning before the throne.