When did three kings day officially start?

Three Kings Day is celebrated on January 6th, twelve days after Christmas. It is often viewed as the last day of the Christmas season (the end of the 12 days of Christmas).

Also known as The Epiphany, Three Kings Day (Día de los Reyes) is a Christian celebration that commemorates the Biblical story of the three kings who followed thestar of Bethlehem to bring gifts to the Christ child. According to the Biblical story, theThree Kings - named Melchior, Caspar and Balthazar - presented the Baby Jesus with gifts of gold, frankincense and myrrh.

I could not find the year it started.