To those Romans December twenty-fifth was the birthday of the sun. They wrote that in gold letters in their calendar. Every year about that time, the middle of winter, the sun was born once more and it was going to put an end to the darkness and misery of winter. So they had a great feast, with presents and dolls for everybody, and the best day of all was December twenty-fifth. That feast, they would tell you, was thousands of years old- before Christ was ever heard of.