Stalling Down is a rolling area of open land [1] a few miles east of the town of Cowbridge, now the village common of St Hilary in the Vale of Glamorgan.

A Roman road runs over the hill as it traverses the area and would have been a convenient route for moving a very large army along for the English.

More recently, historians have begun to question the veracity of the report of a battle at Stalling Down; for example, a modern authority on Glyndŵr, the late R. R. Davies, made no mention of it in his account of the revolt, published in 1995.

The problem lies in the fact that the earliest recorded reference to the battle is late, and is found in the works of the 18th-century historian Iolo Morganwg, although Morganwg's account held considerable sway, and was repeated by several later writers, including the Edwardian historian Arthur Bradley in his 1901 biography of Owain Glyndŵr.

The discovery of a crypt in the area containing three hundred male skeletons without coffins, combined with the fact there is much local tradition to be found in connection with it, and the context of a battle in either the summer of 1403 or 1405 accords well with our understanding of the progress of Glyndŵr's revolt, as Glyndŵr's presence at nearby Carmarthen in the summer of 1403 is well attested, and it may be that an English incursion along the Roman road into nearby Glamorgan produced a confrontation of which the battle of Stalling Down, as remembered today, is a manifestation.