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Birth:          1320 of Tutbury Castle, Tutbury, Staffordshire, England
Death:          1 Sep 1362 Alnwick, Northumberland, England
Burial:         Alnwick, Northumberland, England

Notes
https://en.wikipedia.org/wiki/Mary_of_Lancaster
Mary of Lancaster, Baroness Percy (1320 – 1 September 1362), was the youngest 
surviving child of Henry, 3rd Earl of Lancaster by his wife Maud Chaworth. Through 
her father, she was a great-granddaughter of Henry III of England.
Family[edit]

Mary was born in 1320 or 1321.[1] She was a sister of Henry of Grosmont, 1st Duke of 
Lancaster, Maud, Countess of Ulster, Joan, Baroness de Mowbray, and Eleanor, 
Countess of Arundel. Through her brother Henry, she was the aunt of Blanche of 
Lancaster, first wife of John of Gaunt and mother of Henry IV of England.[2]

Marriage[edit]

Near September 1334 at Tutbury Castle, she married Henry Percy,[1] eldest son of 
Henry Percy, 2nd Baron Percy and Idoine de Clifford. He succeeded his father as 3rd 
Baron Percy in 1352.[3]

They had the following surviving issue:
Henry Percy, 1st Earl of Northumberland (10 November 1341 – 20 February 1408) 
married firstly Margaret Neville and secondly Maud, Baroness Lucy.
Thomas Percy, 1st Earl of Worcester (1344–1403).
Maud Percy, married Sir John de Southeray, illegitimate son of King Edward III and his 
mistress Alice Perrers.
Mary, Baroness Ros (born 1360) married John de Ros, Baron Ros of Helmsley.

Death[edit]

Mary died at Alnwick, Northumberland, England on 1 September 1362, where she was 
also buried. Her husband Henry would marry a second time to Joan Orreby, daughter 
and heiress of John, 2nd Lord Orreby.

Parents
PLANTAGENET Henry (1281 - 22 Sep 1345)
DE CHAWORTH Maud (2 Feb 1282 - 3 Dec 1322)

Siblings
PLANTAGENET Maud "of Lancaster" (ABT 1310 - 5 May 1377)
PLANTAGENET Eleanor (ABT 1311 - 11 Jan 1372)
PLANTAGENET Joan "of Lancaster" (ABT 1312 - 7 Jul 1349)
PLANTAGENET Mary "of Lancaster" (1320 - 1 Sep 1362)

Marriage To DE PERCY Henry (1320 - 18 May 1368)
    m. ABT Sep 1334 Tutbury Castle

Notes

Parents
DE PERCY Henry (6 Feb 1301 - 26 Feb 1352)
DE CLIFFORD Idonea (ABT 1300 - 24 Aug 1365)

Children by DE PERCY Henry 1320 - 18 May 1368
DE PERCY Henry (10 Nov 1341 - 20 Feb 1408)

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