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Birth:          ABT 1255 Hamlake
Death:          BEF 16 Aug 1316 
Burial:         Kirkham, Yorkshire, England

Notes
ancestry.com
https://en.wikipedia.org/wiki/William_de_Ros,_2nd_Baron_de_Ros
William de Ros or Roos, 1st Baron de Ros of Helmsley (c. 1255 – 6 or 8 August 1316), 
was one of the claimants of the crown of Scotland in 1292 during the reign of Edward 
I.[2]
Family[edit]

William de Ros was the eldest son of Robert de Ros (d. 17 May 1285) of Helmsley, 
Yorkshire, and Isabel d'Aubigny (c. 1233 – 15 June 1301), daughter and heiress of 
William D'Aubigny of Belvoir, Leicestershire, and granddaughter of William d'Aubigny.
[3] He had four brothers and three sisters:[4]
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.

Career[edit]

On 24 December 1264 William's father, Robert de Ros (d. 1285), was summoned to 
Simon de Montfort's Parliament in London as Robert de Ros,[5] 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 [of 24 December 
1264], a decision adopted by the Lords in 1806 (Round, Peerage and Pedigree, vol. 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.[6]

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.[7]

William de Ros succeeded to the family honours and estates on the death of his 
mother. He was an unsuccessful competitor for the crown of Scotland, founding his 
claim on his descent from his great grandmother, Isabel, a bastard daughter of William 
I of Scotland. He was buried at Kirkham Priory. He was involved in the wars of 
Gascony and Scotland.[8] He discovered that Robert De Ros, Lord of Werke, 
intended to give up his castle to the Scots. William notified the king of this, who sent 
him with a thousand men to defend that place. The place was then forfeited because 
of the treason of Robert De Ros. William De Ros then took possession of it. William 
was appointed warden of the west Marches of Scotland.[8]

Through his marriage to Maud de Vaux the patronage of Penteney and Blakeney 
Priories in Norfolk and of Frestun in Lincolnshire came into the De Ros family.

Marriage and issue[edit]

William de Ros married, before 1287, Maud de Vaux (born c. 1261), younger daughter 
and coheiress of John De Vaux, by whom he had four sons and three daughters.[9]
William de Ros, 2nd Baron de Ros.
Sir John de Ros (d. before 16 November 1338), who married Margaret de Goushill (d. 
29 July 1349).
Thomas de Ros.
George de Ros.
Agnes de Ros, who married firstly Sir Pain de Tibetot, and secondly Sir Thomas de 
Vere.
Alice de Ros, who married Sir Nicholas de Meinill. Their daughter, Elizabeth de Meinill, 
married Sir John Darcy, 2nd Lord Darcy of Knayth.
Margaret de Ros.

Parents
DE ROS Robert (ABT 1233 - 17 May 1285)
D'AUBIGNY Isabel (1233 - 15 Jun 1301)

Siblings
DE ROS William (ABT 1255 - BEF 16 Aug 1316)

Marriage To DE VAUX Maude (Matilde) (ABT 1260 - )
    m.  

Notes

Parents
DE VAUX John (ABT 1215 - ABT 1288)
____ Sibel (ABT 1222 - )

Children by DE VAUX Maude (Matilde) ABT 1260 - 
DE ROS Agnes (ABT 1280 - )
DE ROS OF HAMLAKE William (1290 - 3 Feb 1343)
DE ROS Margaret (ABT 1298 - 17 Oct 1357)
DE ROS Alice (ABT 1310 - BEF 4 Jul 1344)

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