 The village is renowned for a street of houses that were built by Lord Penrhyn, proprietor of the Penrhyn Quarry and occupier of Penrhyn Castle, to accommodate the workers that refused to strike during the Penrhyn Lockout of 1900-1903.The street, Tanrhiw Road, was known locally as 'Stryd y Gynffon' (Traitor's Row or Tail Terrace) and was one of the first main settlements in the village based alongside the farmsteads of Ty'n Clawdd, Tanrhiw Isaf and Tahrhiw Uchaf.Tregarth has a population of some 1,000 people of which around 80% would consider the Welsh language as their first language.