General Notes

William de Ros, 1st Lord (Baron) de Ros of Helmsley, so created according to later doctrine by writ of summons 6 Feb 1289/90 (but see prior generation for an earlier precedence assigned the title in later centuries); candidate for the Crown of Scotland 1291 by reason of his descent from William the Lion, albeit illegitimate; granted 1301 Wark Castle on its forfeiture for rebellion by his cousin Robert de Ros of Wark; Jt Warden Northumberland 1307, Jt Lt and Warden in Scotland 1308. [Burke's Peerage]

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William de Ros, 1st Lord Ros of Helmsley, MP 1295-1316.  [Magna Charta Sureties]

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William de Ros, 2nd Baron Ros, b. 1255, summoned to parliament as Baron Ros, of Hamlake, from 23 June, 1295, to 6 October, 1315. This nobleman was one of the competitors for the crown of Scotland in the 19th Edward I, 1296, through his grandmother, Isabel, natural daughter of William the Lion, King of Scotland. He was subsequently engaged in the wars of Gascony and Scotland, and discovering the intention of his kinsman, Robert de Ros, then Lord of Werke, to deliver up that castle to the Scots, he lost no time in apprising the king, who thereupon despatched him with 1600 men to defend that place, but the Scots attacking this force upon its march cut it to pieces; when Edward himself advancing from Newcastle-upon-Tyne soon obtained possession of the fort and appointed Lord Ros its governor--allowing him, during his absence in Gascony, to nominate his brother, Robert, lieutenant. In a short time after, he had a grant of this castle with its appurtenances forfeited by the treason of his before-mentioned kinsman; and for several subsequent years, his lordship was actively engaged in Scotland. In the 1st Edward II [1307], he was constituted the king's lieutenant, between Berwick and the river Forth, and in six years afterwards, he was appointed warden of the west marches of Scotland. He m. Maud, or Matilda, one of the daus. and co-heirs of John de Vaux, who brought him the manor of Feston and lands in Boston, co. Lincoln, and had issue: William, his successor; John; Thomas; Margaret; Anne, m. to Paine, son of Robert de Tibetot; Mary, m. 1st to William Braose, and 2ndly, to Thomas de Brotherton, Duke of Norfolk. His lordship d. in 1316 and was s. by his elder son. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, London, 1883, p. 459, Ros, or Roos, Barons Ros]