To the south is Clonmore, site of the 13th-century de Lacy castle, now a picturesque ruin. Ivy is rampant over its 7ft thick walls and cattle graze placidly in the bailey where chain-mailed Norman knights once caroused and quarrelled. The castle changed hands several times before it finally fell to Cromwell in 1650. The north-east tower, known as the Six Windows, is well preserved.
Near the castle, the road cuts through a monastery that was founded in the 6th century by St Mogue. The overgrown churchyard contains a large number of early christian cross decorated stones. Their number is an indication of the region's importance in the early days of christianity.