Many ancient sites dot the River Shannon, but Clonmacnoise is early Christian Ireland's foremost monastic settlement and, like Chartres, a royal site. The monastery was founded by St. Ciarán between 543 and 549 at a location that was not as remote as it now appears to be: near the intersection of what were then two of Ireland's most vital routes—the Shannon River, running north–south, and the Eiscir Riada, running east–west. Like Glendalough, Celtic Ireland's other great monastic site, Clonmacnoise benefited from its isolation; surrounded by bog, it's accessible only via one road or via the Shannon.
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