Parish church of St Decuman
The name is derived from the Welsh language and perhaps means "crwth-player's moor".
Much of the parish and almost all the mediæval village except the church was cleared during the establishment of the BP oil terminal south-west of the village in 1961 and during the construction of the Texaco refinery immediately to the north three years later. A major explosion occurred at the refinery on 2 June 2011, killing four people.
The church is a very early Christian site and was dedicated to Saint Decuman, whence the settlement's original name Llandegeman or Llandegman. It was the "bishop-house" of the cantref of Penfro and one of the seven principal churches in Dyfed. The parish was taken during the Norman invasion and, has been essentially English-speaking for over 900 years. The church is Grade-I listed, and is in the care of Friends of Friendless Churches.
- Charles, B. G., The Placenames of Pembrokeshire, National Library of Wales, Aberystwyth, 1992, ISBN 0-907158-58-7, p 712
- CNN International: Official: Explosion at Chevron refinery in UK kills 4
- Wade-Evans, Arthur. Medieval Welsh Law, p. 263.
- "Rhoscrowther, St Decumanus". Friends of Friendless Churches. http://www.friendsoffriendlesschurches.org.uk/CMSMS/index.php?page=rhoscrowther. Retrieved 30 October 2014.