Who is Jacob in the Bible?

Jacob was the younger of twin sons of Isaac. The other son being Esau who sold his birthright to Jacob for a "Mess of pottage". Both were enemies from childhood until reconciled in later life.

Jacobs name was later changed to Israel.

Some would have it that he deceived his father so that he might receive the blessings of Isaac, but as Esau was not a righteous son the blessing was sanctioned by the Lord upon Jacob, who was righteous all the days of his life.