4. In mediaeval times, this king made his appearance at the end of the year.
From Quiz Some Things about Kings
Answer:
The King of Misrule
Maybe someone somewhere is referred to as the King of Christmas, but I believe I made that up for the purpose of this quiz. The King of Peace, according to Christians, certainly made His appearance at the end of the year, but well before the mediaeval period, and while children believe Kringle is King, he's plain old Kris Kringle.
Also called the Abbot (in Scotland, the Abbot of Unreason) and the Lord of Misrule, the King of Misrule was the director of festive antics at the royal court during mediaeval and Tudor times. His 'reign' lasted for the Twelve Days of Christmas (December 25 to January 5), and he and his henchmen got up to all sorts of silly tricks. In his 'Anatomie of Misuses' (1593), Philip Stubbes wrote that the King of Misrule could have anywhere from 20 to 100 underlings, each mounted on a hobby or a dragon, and went everywhere, including to church, accompanied by a raucous band of musicians.