Pope Boniface IV declared November 1 to be All Saints Day.
These three festivals, known as All Hallows Eve, All Saints Day and All Souls Day, became known as Hallowmas.
In the 800's, Pope Boniface IV moved All Saints Day from May 13 to November 1, thus blurring the two celebrations together.
The popular feeling for the first time found expression when Luther, on All Saints day 1517, nailed to a church door in Wittenberg the theses in which he contested the doctrine Luther which lay at the root of the scandalous traffic in indulgences carried on in the popes name by Tetzel and his like.