On this date in Christmas history

Today is Friday, Dec. 25, the 359th day of 2015. There are six days left in the year. This is Christmas Day.
Today’s Highlight in History
On Dec. 25, 1818, “Silent Night (Stille Nacht)” was publicly performed for the first time during the Christmas Midnight Mass at the Church of St. Nikolaus in Oberndorf, Austria.
On this date
In A.D. 336, the first known commemoration of Christmas on Dec. 25 took place in Rome.
In 1066, William the Conqueror was crowned king of England.
In 177