In New Orleans' revelry and religious tradition are the ties that bind during Mardi Gras. Thus, it's not surprising that the origin of the modern King Cake can be traced back to the Middle Ages, when popular devotion during Christmas turned to the Three Wise Men, or Kings, who had followed a star and paid homage to Christ. Epiphany, the end of the Christmas celebration and the 12th night after the birth of Christ, came to be known as "Twelfth Night," a time for pageants and giving special "King" presents to children.
Today in New Orleans, the King Cake is an oval-shaped braided coffee cake which is decorated with cinnamon sugar in the official Mardi Gras colors – gold (for power), green (faith), and purple (justice) – and contains a tiny plastic baby that has replaced the coin used in medieval times. The person who gets the slice of cake with the baby in it must host the next party; at some parties, they are crowned king or queen.
The cake, a gift shared by family, friends and revelers alike, is eaten between the Twelfth Night and Fat Tuesday, the beginning of Lent. However, the cake often begins appearing during Christmas.