One of the windows on the south side is raised to illuminate the pulpit, a decision that in the eyes of one 19th-century commentator "disfigures the building.

"[2] According to local tradition, a standing stone about 1 mile (1.6 km) away is the petrified remains of a man who stole a bible from the church and was punished by St Tyfrydog as a result.

St Tyfrydog's Church is in a wooded circular churchyard in the middle of the hamlet of Llandyfrydog in Anglesey, north Wales.

[9] An upright stone about 4 feet (1.2 m) high, which stands in a field about 1 mile (1.6 km) from the village, is known as "the thief of Dyfrydog".

[9][10] In his 1191 Itinerarium Cambriae ("Journey through Wales"), Gerald of Wales mentioned the church, saying that when the Normans were ransacking Anglesey during a Welsh revolt led by Gruffudd ap Cynan in 1098, Hugh of Montgomery, one of the Norman lords, had kept his dogs in Llandyfydog church.

[11] A church was recorded here in 1254 during the Norwich Taxation, but the oldest part of the present building is the nave dating from about 1400.

Restoration work took place in 1823, and then again 1862, when the present porch (on the west end of the south wall) and the vestry (to the north) were added, along with other alterations.

[4] Seating is provided in the form of painted box pews, dating from the 19th century, and possibly installed at the time of the restoration work in 1823.

1630" upon it, said to mark it as belonging to the Bulkeley family (who were prominent and influential landowners, in Anglesey and elsewhere in north Wales, from the 15th to the 19th centuries).

[2][17] The churchyard contains a number of slate tombs and a sundial made from brass, dating from the 18th century, standing in the base of a medieval stone cross.

[3][18][19] The 19th-century writer Samuel Lewis said that it was "a lofty and venerable structure, in excellent repair", and with "a remarkably large chancel.