Kells Priory (Irish: Prióireacht Cheanannais) is one of the largest and most impressive medieval monuments in Ireland. The Augustine priory is situated alongside King's River beside the village of Kells in the townland of Rathduff (Madden), about 15 km south of the medieval city of Kilkenny. The priory is a National Monument and is in the guardianship of the Office of Public Works. One of its most striking features is a collection of medieval tower houses spaced at intervals along and within walls which enclose a site of just over 3 acres (12,000 m2). These give the priory the appearance more of a fortress than of a place of worship and from them comes its local name of "Seven Castles".