This John Manners received the honour of knighthood, and married Alice, widow of William de Whitchester; and, dying in 1402, was succeeded by his son, Sir John Manners, who was Sheriff of Northumberland, and, with his son John, was accused of the murder of William Heron and Robert Atkinson or Akyman; they were prosecuted by Sir Robert de Umphreville, and Isabel, widow of William Heron, and were ordered to “cause 500 masses to be sung for the health of the soul of the same William Heron within one year then next ensuing, and pay unto Sir Robert de Umphreville, and Isabel, to the use of the said Isabel and her children by Heron, 200 marks.” He was succeeded by his son Robert, who married Joan, daughter of Sir Robert Ogle, and had issue by her, with others, a son, Robert, by whom he was succeeded. This Sir Robert Manners married Eleanor, daughter of Thomas, Lord Roos (by Philippa his wife, daughter of John, Lord Tiptoft, Earl of Worcester), and sister and co-heiress of Edmund Lord Roos, “whereby he greatly increased his estate, and among other possessions, had the ancient seat of Belvoir Castle, built by Robert de Todenei, a noble Norman, on a stately ascent, overlooking the beautiful valley adjacent (thence by him called _Belvoir_, from the fair view of the country thereabouts), and it became the chief seat of that great barony, bestowed on him by William the Conqueror; which seat and barony, in the reign of Henry III., devolved upon Robert de Roos, a great baron, by marriage with Isabel, daughter and heir of William de Albini, the fourth of that name, descended from the said Robert de Todenei; and from the Lord Roos it came to Sir Robert Manners by his marriage,” as did also many other estates in other counties. The issue of this marriage was three daughters, who each married into the family of Fairfax, and two sons. The eldest of these sons was Sir George Manners, who, on the death of his mother, became Lord Roos, and was also lineal heir to the baronies of Riveaulx, Trusbut, and Belvoir. He married Anne, only daughter and heiress of Sir Thomas St. Leger, by his wife Anne, daughter of Richard, Duke of York, and sister to King Edward IV., and widow of John Holland, Duke of Exeter. By this lady, who brought royal blood into the family, Sir George had a numerous family, the eldest of whom succeeded him.