Who is “The (Arch)angel of the Lord”?

Yet even the Romish website http://ic.net/~erasmus/RAZ16.HTMT/ (Angels and Demons) says the ancient view that God the Son is ‘The Angel of the Lord’ — while "not common in Catholic circles" — certainly "is not heretical."   The Catholic Bible Encyclopedia too states: "It will be seen that this ‘Angel of the Lord’ often speaks and acts as Yahweh Himself."

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The word ‘Archangel’ is not found in the Older Testament.   There, however, Calvin calls the divine Christ ‘Michael your Prince’ at Daniel 10:13 & 10:21 and at 12:1 & 12:6f.   And the Newer Testament, while acknowledging seraphs and cherubs, mentions only one Archangel or Leader of the angels at First Thessalonians 4:16 and Jude 9 and Revelation 12:5-7.