The modern Sulby Grange stands on, or near, the site of 'Mirescog'- a Cistercian house founded in 1176 and dissolved circa 1200.  Mirescog may have been dependent on Rievaulx Abbey in North Yorkshire. The supposed siting of this house at Ballamona is incorrect according to B.R.S. Megaw. The lands of Mirescog were later granted to Rushen Abbey. The suggestion in some sources that the Monastery was still at Mirescog in 1249 is a misinterpretation of a passage in the Chronicle of Man and it was probably dissolved by 1200.