Who is the Mysterious Melhizadek ?

Hebrews 7: Melchizedek the Priest

"This Melchizedek was king of Salem and priest of God Most High. He met Abraham returning from the defeat of the kings and blessed him, and Abraham gave him a tenth of everything. First, the name Melchizedek means “King of Righteousness”; then also, “King of Salem” means “King of Peace.” Without father or mother, without genealogy, without beginning of days or end of life, resembling the Son of God, he remains a priest forever."

Gen 14:18 And Malchizedek the king of Salem brought out bread and wine, and he was a priest to the Most High God. יחוּמַלְכִּי־צֶ֨דֶק֙ מֶ֣לֶךְ שָׁלֵ֔ם הוֹצִ֖יא לֶ֣חֶם וָיָ֑יִן וְה֥וּא כֹהֵ֖ן לְאֵ֣ל עֶלְיֽוֹן: