In 1444, Breadsall priory was sued by the Collegiate Church of St Mary in Leicester, over the tithes of a field called "Hethfield", near Mugginton. St Mary's argued that the field belonged to the Parish of Duffield (which was in their control), and not that of Mugginton (controlled by the priory). The court found in favour of St Mary's and control of the field passed to the collegiate church. The rector of Mugginton was "condemned for contempt of Court of Arches" and ordered to pay the 40s. to St Mary's.