"Pembrokeshire Burials Transcription", database, Findmypast(http://findmypast.co.uk : accessed 24 February 2018), entry for John James burial date 15 July 1857 in Llanfairnantygof; citing Welsh Archive Services

Text from source:

Burials in the Parish of Llanfair nant y gof in the County of Pembroke in the year 1857
Name Abode When buried Age By whom the ceremony was performed
John James Trecwn Mill 15 Jul 1857 86