Who was 'the Angel of the Lord'?

Here are some scripture references to aid your study into this interesting topic.
01. Exodus 3:1-6 - the burning bush passage
02. Joshua 5:13-15 - the Commander of God’s army
03. Judges 2:1-5 - the God of the covenant (Cf. Genesis 12:1-3)
04. Judges 13:1-22 - the God of miracles appears to Mr. and Mrs. Manoah
05. Isaiah 63:8-10 - He does Christ-like work, Also Cf. Exodus 14:19-31
06. Genesis 16:7-13 - the God who sees appears to Hagar
07. Genesis 22:15-18 - calls to Abraham from heaven
08. Genesis 32:24-30 - the Man who wrestles with Jacob is God Himself
09. Numbers 22:22-31 - appears to Balaam
10. Zechariah 1:12 - counsels with the Father as an equal
11. Genesis 14:18-20 - in light of Hebrews 7:1-3, Melchizedek=Christ
12. Genesis 18:1-33 - if only three “men”, one of them was God Himself