Sir Robert FitzWalter had a license in 1275 to pass away the inheritance of Baynard's Castle to Robert Kilwardby, then archbishop of Canterbury, which prelate translated thereto the Dominican or Black Friars from Holborn, near Lincoln's Inn. In alienating this part of his property, Sir Robert took especial care, however, to preserve the immunities of his barony, which, as appertaining to Baynard's Castle, are thus specified: "That the said Robert, as constable of the Castle of London, (so Baynard's Castle was designated), and his heirs ought to be banner bearers of that city, by inheritance as belonging to that castle, and in time of war, to serve the city in the manner following, viz., to pride upon a light horse, with twenty men-at-arms on horseback, their horses covered with cloth or harness, unto the great door of St. Paul's church, with the banner of his arms carried before him."
This Robert FitzWalter was in the wars of Gascony in the 22nd Edward I, in the retinue of Edmund, Earl of Lancaster, and continued there the next year; at which period he was summoned to parliament as a baron, and, from that time to the 19th Edward II. His lordship was afterwards continually engaged in the Scottish wars. He m. 1st, Devorgil, one of the daus. and co-heirs of John de Burgh, and grand-dau. of Hubert de Burgh, Earl of Kent, and by her (who d. 1284) had a son, Robert, b. 1291, m. 1305, --- Botetourt; and an only dau., Christian, m. to John le Marshal, and left a son, William Marshal.
His lordship m. 2ndly, Alianore, dau. of William Ferrers, Earl of Derby, and had an only son, Robert, his successor, and Ida, m. to John de la Ward. The baron d. in 1235 and was s. by his son, Robert FitzWalter, 2nd baron. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 212, FitzWalter, Barons FitzWalter]