Cashel is a market town on the busy Cork–Dublin road, with a lengthy history as a center of royal and religious power. From roughly AD 370 until AD 1101, it was the seat of the Kings of Munster, and it was probably at one time a center of Druidic worship. Here, according to legend, St. Patrick arrived in about AD 432 and baptized King Aengus, who became Ireland's first Christian ruler. One of the many legends
associated with this event is that St. Patrick plucked a shamrock to explain the mystery of the Trinity, thus giving a new emblem to Christian Ireland.