St. Mary’s Church, Mansfieldstown is a medieval church and National Monument in County Louth, Ireland.
Mansfieldstown Church is located 3.7 km (2.3 mi) west of Castlebellingham, on the north bank of the River Glyde.
The earliest reference to a church here is in the Papal Registers of 1299. Archbishop Richard FitzRalph delivered a sermon at Mansfieldstown in 1349, in the midst of the Black Death. The church was recorded as ruined in 1640.
The confusingly named Mansfieldstown Old Church was built in 1691, after the Battle of the Boyne.
The church currently is in ruins. The church incorporates a 15th-century Late Gothic east window. The Late Gothic east window has tracery, stones bars or ribs, that help support glass.
There were many alterations and additions made in the 19th century.
The graveyard surrounding the ruined church has a mixture of very old and more recent burials.
A large, decorated, c. 15th-century baptismal font once stood here. The baptismal font it is now in another church names for St. Mary, St. Mary’s Parish Church, in nearby Ardee. St. Mary’s in Ardee Built was circa 1810 on the site of an earlier church.
During the Black Death, in 1349, Archbishop Richard FitzRalph delivered a sermon at Mansfieldstown.
Mansfieldtown, the townland name, is derived from the Anglo-Norman Maundeville family who settled there after 1172.