The church of St. Michael in Llanfihangel Din Sylwy was mentioned for the first time in the documents from 1254, however the current building dates from the fifteenth century. In the mid-nineteenth century, the church was renovated.
The church consisted of a short nave and a narrower and lower chancel. The latter was illuminated from the east by a three-light window with openings topped with cinquefoils, and from the south by a similar two-light window, both of which were placed in rectangular frames. The nave from the north and south was illuminated by much simpler, narrow, pointed windows.
The southern entrance, as well as the rebuilt west wall, comes from the early modern period, but the original late Gothic windows in the eastern and southern walls of the chancel have survived. From the original furnishings of the church, the late-medieval baptismal font has been preserved, and the original wooden roof truss is also visible.
Salter M., The old parish churches of North Wales, Wolverhampton 1993.
Website britishlistedbuildings.co.uk, Church of St Michael A Grade II Listed Building in Llanddona, Isle of Anglesey.