Croghan Hill ( or Brí Éile) is a hill with a height of in County Offaly, Ireland. The remains of an extinct volcano, it rises from the Bog of Allen and dominates the surrounding plains. Historically known as Brí Éile, it is mentioned in Irish mythology and is traditionally seen as a sacred hill. On the summit is an ancient pagan burial mound with panoramic views, which reputedly became the inauguration site of the kings of Uí Failghe. On the eastern slope is an old graveyard and the remains of a medieval church, while at the western foot of the hill is the remains of a medieval settlement, church and castle. An ancient bog body, Old Croghan Man, was found nearby. The village of Croghan is at the southern foot of the hill.