Fertility played a large part in Celtic and Germanic culture.
The power of kingship stemmed from a divine will giving that individual the right to rule. This will was most easily understood in the behavior of the land. If a kingdom was not producing enough food, then it was believed the king was not worthy of his position.
In many underground beliefs on Britain, worship centered around the fertility of the land. These "cults" dealt chiefly with the concepts of birth, death, and rebirth as a universal norm. The focus was on the belief that earth was a conscious entity, giving of herself for life on the planet.