Melchizedek is described in the Bible as a historical figure who was both the king of Salem and a priest of God Most High. Some key details are that he blessed Abraham and received a tithe from him, had no record of his ancestry, and acted as a priest continually. The document discusses possible interpretations of Melchizedek, including that he prefigures Jesus Christ and anticipates aspects of his role as high priest. One possibility presented is that Melchizedek was the biblical figure Shem, Noah's son, though his identity ultimately remains mysterious.