Tree ring cross dating
According to Fantasy Ireland, the arms also represented the four sacred parts of human beings: mind, soul heart and body, with the center still representing spirit.The cross was also a Celtic symbol of protection, believed to block negativity and prevent physical attack.The arms of the cross are connected by a perfect circle, also usually decorated with Celtic knots.
It is the characteristic symbol of Celtic Christianity, though the symbol has older, pre-Christian origins. This design is also referred to as the Irish Cross, or as the Cross of Iona.
It is believed that he combined the symbol of Christianity, a cross, with the symbol of the sun, to give pagan followers an idea of the importance of the cross by linking it with the idea of the life-giving properties of the sun.
Legends of how the Celtic cross came to be combine both pagan and Christian symbols, many Christians see the circle as a symbol of Christ's eternal love wrapped around the symbol of his sacrifice for his followers.
During the Celtic Tattoo Revival new Tattoos in this style were crafted that added a self-conscious message of Celtic heritage to the widely recognized emblem of the Christian faith.
The circle is often described as an halo or an eternity symbol, or a blending of the old worship of the sun with the new faith of religion.