John De Shelton married Margaret (also called Maud). Some sources says that she was the daughter of Robert De Brus, E. Carrick, and Margaret De Galloway, w. of William De Carlyle. The marriage seems to have been very unhappy. He was dead by 1333, for 27 Jan 1333 a writ was issued from York ordering John De Blomvill, escheator in the counties of Norfolk, Suffolk etc., to take into the King’s hands, the lands late of John De Shelton, tenant-in-chief. In another writ from Cowick the following 15 Mar, the escheator was ordered to ensure that any dower assigned to Margaret, widow of John De Shelton was removed from her hands, as the King had learned that she had long withdrawn from her husband to be with her paramour and since she was never reconciled with him, should have no dower. Copinger says that she eventually remarried to Thomas Kenyng.1251

13th Lord of Shelton was Knighted of Shire of Cumberland. Kathryn M Brown, p 16, says he suceeded his cousin, Richard, to the Shelton estates. He was also known as John de Schelton. He lived in Skelton Castle, Cumberland; and was a Knight of the Shire of Cumberland. Kathryn M Brown, p 13, gives quite a bit of data on Sir John and lists his two wives as Maud and Hawys, daughter of Prince of Powys of Wales.1251