From Wikipedia, the free encyclopedia. Llanfair PG or Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch is a village on the island of Anglesey in Wales, Britain. It is in the Guinness Book of Records for being the place with the longest name in Britain. The name means St Mary's church in the hollow of the white hazel near to the fierce whirlpool of St Tysilio of the red cave in Welsh. It was invented in the 1860s by a local tailor to make the village famous for having the railway station with the longest name.