 In 970, Donell, son of Murcha, pillaged and burnt Clonard.From the Synod of Ráth Breasail (1111), it was the centre of the new see of Clonard, to which, were added the bishoprics of Trim, Ardbraccan, Dunshaughlin, and Slane, indicating its importance at the time.This was confirmed at the Synod of Kells in 1152.