Díseart Aonghasa, or Dísert Óengusa, was founded in 780 by Saint Óengus of Tallaght. The monastery was associated with the Céile Dé or Culdees (meaning client of God), an early Christian ascetic movement. Today the site comprises the remains of a multi-period church, a round tower and a graveyard, all originally surrounded by a stone enclosure. Much altered over the centuries, the first of these was used as a parish church until 1418, while the graveyard ceased to be used after 1868. Although now incomplete and missing its conical cap, the limestone round tower still rises 20.65 metres and five storeys. Dating from the 11th/12th centuries, it has three windows as well as a doorway on the first level with carved sandstone used for their dressings.
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