Richard’s Genealogy
Family: Henry Percy, Baron Alnwick / Mary of Lancaster (F1257)
m. Abt Sep 1334Henry, Earl of Lancaster (1281-1345) 
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Maud Chaworth (1285-1322)
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| Henry, Duke of Lancaster (1300-1361) |
Blanche of Lancaster (1305-1380)  |
| Matilda of Lancaster (1310-1377) |
| Joan of Lancaster (1312-1345) |
| Isabella of Lancaster (1317-1347) |
| Eleanor of Lancaster (1318-1372) |
| Henry Percy, Baron Alnwick (1322-1368) |
| Mary of Lancaster (1320-1362)
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| Henry Percy, Earl of Northumberland (1341-1408) |
| Thomas Percy, Earl of Worcester (1344-1403) |
| Mary Percy (1360- ) |