The Celtic Cross (Ionic cross) has its roots in a pre-Christian variation of the Solar cross. Examples of the Celtic cross date back as far as 5000 years BCE.  The origin of the Celtic cross are not clear, but it was known to be an early symbol of the Gallic sun god Taranis. After the conversion of the Celtic people to Christianity, the Celtic Cross became an emblem of the Celtic Christian Church. Irish legend holds that the cross was introduced to Ireland by St. Columba, so it is sometimes referred to as Columba’s cross, or the Ionic cross, after his monastery on the isle of Iona.