The bull's head decoration used on the church denotes a connection with the Bulkeleys of Beaumaris, a prominent north Wales family over several centuries.

Set in a remote part of the countryside in the middle of Anglesey, it is dedicated to St Twrog, who was active in the late 5th and early 6th centuries.

The church is in a churchyard in "a remote rural location" on Anglesey, Wales, about 4 miles (6.4 km) from the county town of Llangefni, at the side of a small road between Gwalchmai and Llynfaes.

[7] The present church dates from the time of King Henry VII (ruled 1485–1509), when a significant amount of building work took place in Wales.

The church tithes had been paid to Jesus College, Oxford (who had built a "neat parsonage-house" in Llandrygarn) since 1648, Lewis said, subject to a small deduction for distribution to the poor of the parish.

[10] The church is built from rubble masonry, dressed with limestone; the roof is made from slate, with a stone bellcote at the west end and a bell dating from 1668.

The three bull's heads pattern is associated with the Bulkeley family of Beaumaris, who were prominent and influential landowners, in Anglesey and elsewhere in north Wales, from the 15th to the 19th centuries.

[2][12] In 1500, about the time that the church was rebuilt, Richard Bulkeley was Archdeacon of Anglesey and so would have been involved in the work here, and is likely to have contributed towards the cost.

[2] The church, which is lit by gas lamps, contains box pews in the nave, and a panelled reading desk with a matching pulpit, one on each side in the sanctuary.