Mary de Ros 
Mary was born about 1300. Mary's father was William de Ros III Baron Ros of Belvoir and her mother was Maud de Vaux. Her paternal grandparents were Sir Robert de Ros IV Baron Ros of Belvoir and Isabel de Albini; her maternal grandfather was John de Vaux of Freston. She had three brothers and two sisters, named William de Ros IV, John, Thomas, Agnes (Anne) and Margaret. She died in 1362.General Notes
There is confusion about who Mary married before Thomas. Burke says she is
the widow of William le Brus. Lori Garner Elmore gives her father as William de Ros (1250-1316). Lori has her marrying William de Braose. The Univ. of Hull database has her marrying William le Brus, and the daughter of Sir Piers de Braose.
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Ancestor Pedigree Chart
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- b.BET. 1170 - 1173 in Helmsley, Holderness, Yorkshire d.<23 Dec 1226 in of Helmsley, Holderness, Yorkshire
- b.BET. 1192 - 1193 in Helmsley, Yorkshire, England d.~ 1264 in Kirkham, England
- b.~ 1165 in Scotland
- b.~ 1223 in Belvoir d.17 May 1285 in Kirkham, England
- b. in Brecknock, Wales d.01 Jun 1235
- b.~ 1196 in Helmsley, Yorkshire, England d.> 1266
- d.< 1225
- b.BET. 1250 - 1255 in Yorkshire, England d.15 Aug 1316
- b.1165 in of Belvoir Castle, Leicestershire d.<30 Mar 1221 in Cainell, near Rome, Italy
- b. in of Belvoir Castle, Leicestershire d.1247
- b.1171 d.1233
- b.~ 1223 in of Belvoir Castle, Leicestershire d.15 Jun 1301
- b.~ 1300 d.1362
- b. in of Freston, Lincolnshire d.1287
- b.~ 1244
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‌Mary and Thomas de Brotherton were married in a religious ceremony about 1328. They had a son named John.
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