 In 1860, owing to the distance between local parish churches and the parishioners in Sarn, a petition was made to Queen Victoria, the Supreme Governor of the Church of England, with the signatures of both the Bishop of St Davids and the Bishop of St Asaph to amalgamate the surrounding churches in the area into a consolidated chapelry.The petition also mentioned the Holy Trinity area, which only had a chapel of ease called Chapel of Llanfihangel in Kerry, Powys to serve Anglicans at the time, though there had been a Baptist church in the village since 1826.The Queen made an Order-in-Council for Holy Trinity Church to be constructed as a parish church to serve the people of Sarn and created the parish of Holy Trinity, Sarn to be under the control of the Diocese of St Davids.