The Abbey of St Mary is a ruined Benedictine abbey in York, England and a scheduled monument. History Once one of the most prosperous abbeys in Northern England, its remains lie in what are now the York Museum Gardens, on a steeply-sloping site to the west of York Minster. The original church on the site was founded in 1055 and dedicated to Saint Olaf. After the Norman Conquest the church came into the possession of the Anglo-Breton magnate Alan Rufus who granted the lands to Abbot Stephen and a group of monks from Whitby. The abbey church was refounded in 1088 when the King, William Rufus, visited York in January or February of that year and gave the monks additional lands. The following year he laid the foundation stone of the new Norman church and the site was rededicated to the Virgin Mary. The foundation ceremony was attended by bishop Odo of Bayeux and Archbishop Thomas of Bayeux. The monks moved to York from a site at Lastingham in Ryedale in the 1080s and are recorded there in the Domesday Book of 1086. Following a dispute and riot in 1132, a party of reform-minded monks left to establish the Cistercian monastery of Fountains Abbey. In 1137 the abbey was badly damaged by a great fire. The surviving ruins date from a rebuilding programme begun in 1271 and finished by 1294. Precinct The abbey occupied an extensive precinct site immediately outside the city walls, between Bootham and the River Ouse. The original boundary included a ditch and a narrow strip of ground, but the walled circuit was constructed above this in the 1260s in the Abbacy of Simon de Warwick; the walls were nearly three-quarters of a mile long. In 1318 the abbot received royal permission to raise the height of the wall and crenellate it; a stretch of this wall still runs along Bootham and Marygate to the River Ouse. The gatehouse in Marygate and its lodge formed part of a range of buildings that linked to the older church of St Olave by a chapel dedicated to Mary. Though work on the chapel and gatehouse was under way 1314 and completed in 1320, the surviving structures are mostly of fifteenth-century origin. St Mary's Tower is a structure at the corner of Marygate and Bootham. Abbey Church The abbey church is aligned northeast–southwest, due to restrictions of the site. The