{{Use dmy dates|date=April 2022}} {{Infobox royalty| | name =Mary of Lancaster | title = Baroness Percy | image = | caption = | spouse =Henry Percy | issue =Henry Percy, 1st Earl of Northumberland<br />Thomas Percy, 1st Earl of Worcester | full name = | house =Lancaster | father =Henry, 3rd Earl of Lancaster | mother =Maud Chaworth | birth_date = {{circa|1320–21}} | birth_place = Tutbury Castle, Staffordshire, England | death_date = {{death date|1362|9|1|df=y}} (aged {{age range|from1=1321|from2=1320|to=1362}}) | death_place = Alnwick, Northumberland, England |}} {{First House of Lancaster|henry3}} '''Mary of Lancaster, Baroness Percy''' ({{circa|1320–1321}} – 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== Mary was born in 1320 or 1321.{{sfn|Weir|2008|p=80}} 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.{{sfn|Weir|2008|pp=77–80}}

==Marriage== Near September 1334 at Tutbury Castle, she married Henry Percy,{{sfn|Weir|2008|p=80}} eldest son of Henry de Percy, 2nd Baron Percy{{sfn|Weir|2008|p=80}} and Idoine de Clifford. He succeeded his father as 3rd Baron Percy in 1352.{{sfn|Bean|2004}}

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).

==Death== 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.

==Ancestry== {{ahnentafel |collapsed=yes |align=center |boxstyle_1=background-color: #fcc; |boxstyle_2=background-color: #fb9; |boxstyle_3=background-color: #ffc; |boxstyle_4=background-color: #bfc; |boxstyle_5=background-color: #9fe; |1= 1. '''Mary of Lancaster''' |2= 2. Henry, 3rd Earl of Lancaster{{sfn|Weir|2008|p=80}} |3= 3. Maud Chaworth{{sfn|Weir|2008|p=80}} |4= 4. Edmund Crouchback, 1st Earl of Lancaster |5= 5. Blanche of Artois |6= 6. Patrick de Chaworth, Lord of Kidwelly |7= 7. Isabella de Beauchamp |8= 8. Henry III of England |9= 9. Eleanor of Provence |10= 10. Robert I of Artois |11= 11. Matilda of Brabant |12= 12. Patrick de Chaworth |13= 13. Hawise de London |14= 14. William de Beauchamp, 9th Earl of Warwick |15= 15. Maud FitzJohn |16= 16. John of England |17= 17. Isabella of Angoulême |18= 18. Ramon Berenguer IV, Count of Provence |19= 19. Beatrice of Savoy |20= 20. Louis VIII of France |21= 21. Blanche of Castile |22= 22. Henry II, Duke of Brabant |23= 23. Marie of Hohenstaufen |28= 28. William Beauchamp |29= 29. Isabella Mauduit |30= 30. John FitzGeoffrey |31= 31. Isabel Bigod }}

==References== {{reflist|30em}}

'''Works cited''' {{refbegin|30em}} *{{cite ODNB |last=Bean |first=J.M.W.|year=2004 |title=Percy, Henry, third Lord Percy (c.1321–1368) |id=21930}} *{{cite book|first=Alison|last=Weir |authorlink=Alison Weir|title=Britain's Royal Families, The Complete Genealogy |publisher=Vintage Books |year=2008 |isbn=978-0-09-953973-5 }} {{refend}}

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{{DEFAULTSORT:Mary Of Lancaster}} Category:House of Plantagenet Category:1320s births Category:1362 deaths Category:14th-century English nobility Category:14th-century English women Category:Daughters of English earls Percy Mary