Do you know the origin of Halloween?

As we already know, Halloween is a very well-known festivity all around the world. It is a time of both celebration and superstition. However, the real origin of Halloween is the following one:

History traces Halloween back to the ancient religion of the Celtics in Ireland. Celtic people were very conscious of the spiritual world and had their own ideas: they used to help their over 300 gods to defeat their enemies in battle, or to imitate the gods in showing cleverness.