Mary of Lancaster

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Mary of Lancaster
Baroness Percy
Spouse Henry Percy, 3rd Baron Percy
Issue Henry Percy, 1st Earl of Northumberland
Thomas Percy, 1st Earl of Worcester
Maud Percy
Mary, Baroness Ros
House Plantagenet
Father Henry, 3rd Earl of Lancaster
Mother Maud Chaworth
Born 1320-21
Tutbury Castle, Staffordshire, England
Died 1 September 1362 (aged 41-42)
Alnwick, Northumberland, England

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.[1]


Mary 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.


In September or before, 1334 at Tutbury Castle, she married Henry Percy, eldest son of Henry Percy, 2nd Baron Percy and Idoine de Clifford.[2] He succeeded his father as 3rd Baron Percy in 1352, making her known as Baroness Percy until her death.

They had the following surviving issue:


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.



  1. ^ Weir, p. 80
  2. ^ Weir pp. 80-81