William de Ros or Roos, 1st Baron de Ros of Helmsley, was one of the claimants of the crown of Scotland in 1292 during the reign of Edward I.
Background
William de Ros was the eldest son of Robert de Ros (d 17 May 1285) of Helmsley, Yorkshire, and Isabel d"Aubigny (c1233 – 15 June 1301), daughter and heiress of William D."Aubigny of Belvoir, Leicestershire, and granddaughter of William d"Aubigny.
Career
Sir Robert de Ros of Gedney, Lincolnshire. John de Ros. Nicholas de Ros, a cleric. Peter de Ros, a cleric.
Isabel de Ros, who married Walter de Fauconberg, 2nd Baron Fauconberg.
Joan de Ros, who married John Lovell, 1st Baron Lovell. Mary de Ros, who married William de Braose, 1st Baron Braose.
On 24 December 1264 William"s father, Robert de Ros (d1285), was summoned to Simon de Montfort"s Parliament in London as Robert de Ros, and for some time it was considered that the barony was created by writ in that year, and that Robert de Ros was the 1st Baron Ros. According to The Complete Peerage: In 1616 the barony of De Ros was allowed precedence from this writ, a decision adopted by the Lords in 1806 (Round, Peerage and Pedigree, volume i, pp 249-50).
But these writs, issued by Simon in the King"s name, are no longer regarded as valid for the creation of peerages.
Accordingly, the barony is now considered to have been created when William de Ros was summoned to Parliament from 6 February 1299 to 16 October 1315 by writs directed Willelmo de Ros de Hamelak. William de Ros succeeded to the family honours and estates on the death of his mother. He was buried at Kirkham Priory.
He was involved in the wars of Gascony and Scotland.
He discovered that Robert De Ros, Lord of Werke, intended to give up his castle to the Scots. The place was then forfeited because of the treason of Robert De Ros.
William De Ros then took possession of lieutenant William was appointed warden of the west Marches of Scotland.
A video relating to relics found belonging to William de Ros and the Battle of Falkirk can be seen on YouTube under the title "braveheart battle camp metal detecting uk".
Views
William notified the king of this, who sent him with a thousand men to defend that place.