Eldest son of Sir Robert de Ros/Roos and Isabel d'Albini/d'Aubigney. Grandson of Sir William de Roos, 4th Baron Hamlake and Lucy FitzPiers, William d'Albini IV and Isabel. Born in Hamslake, now known as Helmsley.
Husband of Maud de Vaux, daughter and co-heiress of Sir John. They had several children:
* William de Ros, 2nd Baron de Ros married Margery de Badlesmere
* Sir John de Ros married Margaret de Goushill
* Thomas de Ros
* George de Ros
* Agnes de Ros, married Sir Payn Talbot & Sir Thomas de Vere
* Alice de Ros, who married Sir Nicholas de Meinill
* Margaret de Ros
William succeeded to the family honors on the death of his mother, and was an unsuccessful competitor to the crown of Scotland, basing his claim in his descent from his great grandmother, a daughter of William I of Scotland by a mistress.
When Robert de Ros, Lord Werke, was intending on surrendering his castle to the Scots, William warned the king who sent thousands of men for support. William took possession of the castle and became the Marshall of the West Marches.
Husband of Maud de Vaux, daughter and co-heiress of Sir John. They had several children:
* William de Ros, 2nd Baron de Ros married Margery de Badlesmere
* Sir John de Ros married Margaret de Goushill
* Thomas de Ros
* George de Ros
* Agnes de Ros, married Sir Payn Talbot & Sir Thomas de Vere
* Alice de Ros, who married Sir Nicholas de Meinill
* Margaret de Ros
William succeeded to the family honors on the death of his mother, and was an unsuccessful competitor to the crown of Scotland, basing his claim in his descent from his great grandmother, a daughter of William I of Scotland by a mistress.
When Robert de Ros, Lord Werke, was intending on surrendering his castle to the Scots, William warned the king who sent thousands of men for support. William took possession of the castle and became the Marshall of the West Marches.
Eldest son of Sir Robert de Ros/Roos and Isabel d'Albini/d'Aubigney. Grandson of Sir William de Roos, 4th Baron Hamlake and Lucy FitzPiers, William d'Albini IV and Isabel. Born in Hamslake, now known as Helmsley.
Husband of Maud de Vaux, daughter and co-heiress of Sir John. They had several children:
* William de Ros, 2nd Baron de Ros married Margery de Badlesmere
* Sir John de Ros married Margaret de Goushill
* Thomas de Ros
* George de Ros
* Agnes de Ros, married Sir Payn Talbot & Sir Thomas de Vere
* Alice de Ros, who married Sir Nicholas de Meinill
* Margaret de Ros
William succeeded to the family honors on the death of his mother, and was an unsuccessful competitor to the crown of Scotland, basing his claim in his descent from his great grandmother, a daughter of William I of Scotland by a mistress.
When Robert de Ros, Lord Werke, was intending on surrendering his castle to the Scots, William warned the king who sent thousands of men for support. William took possession of the castle and became the Marshall of the West Marches.
Husband of Maud de Vaux, daughter and co-heiress of Sir John. They had several children:
* William de Ros, 2nd Baron de Ros married Margery de Badlesmere
* Sir John de Ros married Margaret de Goushill
* Thomas de Ros
* George de Ros
* Agnes de Ros, married Sir Payn Talbot & Sir Thomas de Vere
* Alice de Ros, who married Sir Nicholas de Meinill
* Margaret de Ros
William succeeded to the family honors on the death of his mother, and was an unsuccessful competitor to the crown of Scotland, basing his claim in his descent from his great grandmother, a daughter of William I of Scotland by a mistress.
When Robert de Ros, Lord Werke, was intending on surrendering his castle to the Scots, William warned the king who sent thousands of men for support. William took possession of the castle and became the Marshall of the West Marches.
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