Los tres reyes magos literally means “The Three King Wizards”, but is usually interpreted to mean “The Three Wise Men” or “The Three Kings”. Their celebration day (January 6th) is refered to as “Three Kings Day” or just “The Day of the Kings”.
As you may know the Three Kings, Balthasar (Spanish = Baltasar), Gaspar and Melchior (Spanish = Melchor) arrived twelve days after the birth of Jesus, bearing their famous gifts of gold, and frankincense and myrrh.
As such in Mexico, this is the day that people give and receive gifts. And as children in the United States and other countries might wait with great anticipation the arrival of Santa Claus, in Mexico the children await the arrival of the Three Kings.
On January 5th at night the children return to their homes to prepare for the arrival of the Three Kings. They place their shoes on the windowsills and fill them with straw, carrots and barley for the donkeys of the Three Kings. Sometimes they might also leave some food for the Three Kings. The next morning the children wake up early to open their presents.