More Than One Archangel? – Who is “The Angel of the Lord”?

Also the Greek Father Eusebius in his Church History I:2:1-13 remarked: “In Christ, there is a twofold nature….   Who, beside the Father, could clearly understand the Light Who was before the world – the intellectual and essential Wisdom Who existed before the ages; the living Word Who was in the beginning with the Father; and Who was God?….  

“The Lord God…appeared as a common man to Abraham while he was sitting at the oak of Mamre [Genesis 18:1f].   And he, immediately falling down, although he saw a man with his eyes, nevertheless worshipped Him as God and sacrificed to Him as Lord and confessed that he was not ignorant of His identity when he uttered the words: ‘Lord, the Judge of all the earth, will You not execute righteous judgment?’ [Genesis 18:25]….