Clonmacnoise — Wikipedia

Clonmacnoise or Clonmacnois (Irish: Cluain Mhic Nóis) is a ruined monastery in County Offaly in Ireland on the River Shannon south of Athlone, founded in 544 by Saint Ciarán, from Rathcroghan, County Roscommon. Until the 9th century it had close associations with the kings of Connacht. Saint Ciarán founded the monastery in the ancient territory of Uí Maine at a point where the major east–west land route (Slighe Mhor) meets the River Shannon after crossing the bogs of Central Ireland known as the Esker Riada. The strategic location of the monastery helped it become a major centre of...