Montpelier Hill (Irish: Cnoc Mount Pelier) is a 383 metres (1,257 foot) hill in County Dublin, Ireland. It is commonly referred to as the Hell Fire Club (Irish: Club Thine Ifreann), the popular name given to the ruined building at the summit believed to be one of the first Freemason lodges in Ireland. This building – a hunting lodge built in around 1725 by William Conolly – was originally called Mount Pelier and since its construction the hill has also gone by the same name. The building and hill were respectively known locally as 'The Brass Castle' and 'Bevan's Hill', but the original Irish name of the hill is no longer known although the historian and archaeologist Patrick Healy has suggested that the hill is the place known as Suide Uí Ceallaig or Suidi Celi in the Crede Mihi, the twelf