Bessy Bell and Mary Gray (Roud 237, Child 201) is an English-language folk song.
According to the ballad, Bessy and Mary were daughters of two Perthshire gentlemen, who in 1666 built themselves a bower to avoid catching a devastating plague.
The supposed site of Bessie Bell and Mary Gray's bower, and of their grave, is recorded in a c.1860 Ordnance Survey name book, with the following comments:[1] The site of bower and grave is on the banks of the River Almond and east of Burn Brae.
Sliabh Troim ('mountain of elder') is the original Irish name of Bessy Bell, also recorded as Sliab Toad.
There also exist twin hills in Staunton, Virginia which were named after the girls by Scottish immigrants.