It was the god of death who ruled for the following months.

On that day, the was a lot weaker and the god of death became much more powerful. It was also believed that these spirits could steal people's kids, torment the people and even kill them. This was the end of their year and therefore, their New Year's Eve, too, a day which marked the arrival of the winter. In order to avoid any unfortunate events, people had to bring gifts to the spirits and it didn't matter if they were coming from humans or from animals and they needed to disguise themselves in spirits and join them, thus confusing the evil spirits. The Celts believed that the border which separated the living from the dead was much more fragile on this day and that the evil spirits could come on earth and haunt and possess the ones on Earth. The druids, who were the Celtic priests, believed in two great gods the god of death and the god of sun.

Around 1000 AD, the Celts who lived in Great Britain celebrated Samhain on the 31st of October.