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 | King of England John Plantagenet (1166-1216)
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 | Queen Consort of England Isabella of Angoulême (1188-1246)
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 | Lady of Wales and Snowdon Lady Joan Plantagenet (1191-1237)  |
 | Henry Plantagenet, III (1207-1272) |
 | 1st Earl of Pembroke William Marshall, the Elder (1146-1219) |
 | 4th Countess of Pembroke Isabella de Clare (1172-1220)
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| Sibyl Marshall (1209-1245) |
 | 1st Earl of Cornwall Richard Plantagenet (1209-1272)
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 | Countess of Cornwall Isabel Marshall (1200-1240)
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We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
