 = St Mary 's Church , Rhodogeidio = 
 
 St Mary 's Church , Rhodogeidio is a small medieval church , dating from the 15th century , near Llannerch @-@ y @-@ medd , in Anglesey , north Wales . It served as a chapel of ease to another church in the area , St Ceidio 's . Some restoration work was carried out in the 19th century , but St Mary 's has since fallen into disuse and is now largely in ruins . 
 It is a Grade II listed building , a national designation given to " buildings of special interest , which warrant every effort being made to preserve them " , in particular because it is " a late Medieval church of exceptionally simple character " , and is virtually unaltered despite its poor condition . One writer has said that St Mary 's " has the distinction of probably being the most isolated church in Anglesey " . 
 
 = = History and location = = 
 
 St Mary 's Church is in the countryside in Rhodogeidio , in Anglesey , north Wales . It is about 1 @.@ 5 miles ( 2 @.@ 4 km ) north of Llannerch @-@ y @-@ medd , towards the north of Anglesey . It is reached by a footpath from a farm – it is only accessible on foot – and is surrounded by a churchyard . 
 It was built in the 15th century as a chapel of ease to serve St Ceidio 's Church , Rhodogeidio , about 0 @.@ 75 miles ( 1 @.@ 25 km ) to the east . Restoration work was carried out in the 19th century , but the church later fell into disuse . It has been in ruins since sometime between 1937 , when the survey by the Royal Commission on Ancient and Historical Monuments in Wales and Monmouthshire recorded its condition as " fair " , and 1970 , when it was given listed building status and its " very poor " condition noted . 
 
 = = Architecture and fittings = = 
 
 St Mary 's is a small church , measuring 30 feet by 12 feet 3 inches ( about 9 @.@ 1 by 3 @.@ 7 m ) . It dates from the late medieval period , and was constructed using rubble masonry and large stones . It had a slate roof , although most of the roof has now gone , and there is a bellcote at the west end , which may be original rather than a later addition . There is no physical division between the nave and the chancel , although one account in the 19th century said that there had originally been a screen separating them , and some traces of it still remained at that time . 
 Entrance to the church was through a doorway with a square head , in the north wall at the west end ; this dates from the 19th century . An inscribed stone near the doorway has the date 1798 and some initials , and it has been suggested that this marked the date of some renovation work . There are two windows on the south wall , one fully blocked and one partially blocked . The small window at the east end of the church dates from the latter part of the 15th century . 
 Inside , little remains , but the ruins still have most of the original roof trusses ( one , at the west end of the church , is a replacement ) . There are some slate memorial tablets on the walls , dating from the middle of the 19th century , and a plain 12th @-@ century circular font . The 1937 survey noted a bell dating from 1717 and some portions of 17th @-@ century panelled seating near the pulpit ; these were not recorded when the church was given listed status in 1970 . 
 
 = = Assessment = = 
 
 St Mary 's has national recognition and statutory protection from alteration as it has been designated as a Grade II listed building – the lowest of the three grades of listing , designating " buildings of special interest , which warrant every effort being made to preserve them " . It was given this status on 12 May 1970 and has been listed because it is " a late Medieval church of exceptionally simple character " . Cadw ( the Welsh Government body responsible for the built heritage of Wales and the inclusion of Welsh buildings on the statutory lists ) also notes that despite its " very poor condition " , St Mary 's " is a virtually unaltered late Medieval building ( even retaining the original roof trusses ) and in its isolation , is characteristic of many churches on the island . " 
 Writing in 1859 , the clergyman and antiquarian Harry Longueville Jones called it a " small , plain , single @-@ aisled chapel " , and said that one of the small south windows was " a good specimen of its kind . " A 2006 guide to the churches of Anglesey says that the " roofless ruin " of St Mary 's " has the distinction of probably being the most isolated church in Anglesey " . 
 
 