The ancient parish of Llandrillo yn Rhos lies in the extreme north-west corner of Denbighshire. It originally contained the townships of Eirias, Colwyn, Rhiw, Cilgwyn, Llwyd Coed, Mochdre, and Dinerth (also spelled Dinarth). It was bounded on the east by Llysfaen parish, on the west by Llangwstenin and Eglwysrhos parishes (in Caernarfonshire), and on the north by the sea.
Until 1924, the parish of Llysfaen and the adjacent township of Eirias formed a detached portion of Caernarfonshire, within Denbighshire. There was also a detached portion of Eirias township in the extreme north-west corner of the parish.
St. George's church, in the centre of the new development which had become known as Rhos on Sea, was opened in 1913, as a district church within the parish of Llandrillo yn Rhos.
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For family history information about the churches and parish, visit the GenUKI Llandrillo yn Rhos page.