Who were the three Magi?

The three Magi were three kings from the Biblical telling of the birth of Jesus.  These kings brought gifts of gold, frankincense, and myrrh to the baby Jesus.  The title The Gift of the Magi comes from these Biblical kings who came bearing gifts.  In the O. Henry story, Della sells her long hair to buy a watch chain for her husband, Jim.  Jim sells his watch to buy combs for Della.  The story centers around their sacrifices and the gifts that they purchased.  At the end of the story, O. Henry writes that the three Magi invented the art of gift giving at Christmastime.  He also states that Jim and Della were the wisest of all.  He adds that all those "who give and receive gifts" are wise because "they are the magi."