 
				Plantagenet, Mary Baroness Percy
| Birth Name | Plantagenet, Mary Baroness Percy | 
| Gender | female | 
| Age at Death | 42 years, 8 months | 
| Birth date | 1320 (Tutbury, Staffordshire, England) | 
| Death date | 1 September 1362 (Alnwick, Northumberland, , England) | 
Events
| Event | Date | Place | Description | Sources | 
|---|---|---|---|---|
| Birth | 1320 | Tutbury, Staffordshire, England | ||
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| Death | 1 September 1362 | Alnwick, Northumberland, , England | ||
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Parents
| Relation to main person | Name | Birth date | Death date | Relation within this family (if not by birth) | 
|---|---|---|---|---|
| Father | Plantagenet, Henry “Tortcol” Earl of Lancaster | 1281 | 22 September 1345 | |
| Mother | Chaworth, Maud de | 2 February 1282 | 19 February 1317 | |
| Sister | Plantagenet, Maud de Lancaster | 1298 | 22 September 1345 | |
| Brother | VanLancaster, Hendrik Grosmont | 1299 | 24 August 1361 | |
| Sister | Plantagenet, Isabel | 1308 | 1 February 1347 | |
| Sister | Plantagenet, Eleanor | 11 September 1311 | 11 January 1372 | |
| Sister | Plantagenet, Joan of Lancaster | 1312 | 7 July 1349 | |
| Plantagenet, Mary Baroness Percy | 1320 | 1 September 1362 | ||
| Sister | Plantagenet, Blanche of Lancaster Baroness Wake of Liddell | 
Families
| Family of De Percy, Henry Earl of Northumberland and Plantagenet, Mary Baroness Percy | |||||||||||||||
| Married | Husband | De Percy, Henry Earl of Northumberland ( * 10 November 1341 + 19 February 1407 ) | |||||||||||||
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