The church appears for the first time in historical sources in 1254 on the annat list (Norwich Taxation), but the building is older and probably dates back to the 12th century. Perhaps in the 13th century the chancel of the church was extended to the east, but there is also the possibility that it is an extremely long 12th-century presbytery. In the fourteenth century, the southern transept was added, but it is unknown because of later modernization, when the northern transept was created. Transepts were once referred to as “Congl Siarad” and served as a kind of local court, in which local disputes were settled. In the sixteenth century, a tower was added, which three hundred years later received a crown in the form of a spire. The church was restored in 1840 and again in 1870 and in the 90s of the twentieth century.
The church consists of a longitudinal, rectangular nave and also a rectangular, long chancel, which are the oldest elements of the building. From the north and south side, there are short and small transepts at the nave. The southern entrance to the nave is preceded by the porch, probably also from a medieval period. The western side is occupied by a sixteenth-century, four-stepped tower, topped with a parapet and battlement. Perhaps the church from the 12th century yet had a central tower above the intersection of naves, as can be seen in the joining of walls. Inside the nave and presbytery there is a 15th-century arch-braced roof. In addition, the 12th-century pulpit in the western part of the nave is worth attention.
Strona internetowa britishlistedbuildings.co.uk, Church of St Mechell, A Grade II Listed Building in Llanfechell, Isle of Anglesey.