Ardbraccan is an ancient place of Christian worship in County Meath, Ireland. It is the location of the former residence of the Roman Catholic, then, after the Reformation, the Church of Ireland Bishop of Meath. It is located approximately 30 miles (48 kilometres) from Dublin.
Ardbraccan originated as a place of Christian worship under St. Breacain (also spelt St. Braccan - d.650 AD ) in the 7th century. Its name in the Irish language comes directly from the saint's name: Ard Breacain, namely the height or Hill of Braccan. On this high point, a monastery and a succession of churches were built, each larger than the last to accommodate the growing number of religious worshippers. The most famous was a large circular church known as the Daimhliag ("stone house"), which was burned to the ground by Viking attackers in the 12th century. Contemporary records say that one thousand people were in the church, seeking protection from the invaders, at the time. According to the historical tract Cogad Gaedel re Gallaib, Ardbraccan was the site of a victory of the Uí Néill over the Vikings sometime in the mid-9th century.
On 29 June 1210 King John of England, Lord of Ireland and his forces met with Cathal Crobhderg, King of Connacht and his men in Ardbraccan before proceeding north to attack the forces of Hugh de Lacy, 1st Earl of Ulster.
The early Irish church possessed many bishoprics or dioceses, each presided over by a Bishop. For a period, Ardbraccan itself was a diocese, with a large urban centre attached. Under the Synod of Kells in 1152, Ardbraccan was united with the Sees of Clonard, Trim, Dunshaughlin, Slane and Fore, forming with other small dioceses the Diocese of Meath. Its central importance was shown in the fact that the new merged diocese's bishop lived in Ardbraccan.