Family: William De Ferrers, III / Sibyl Marshall (F15336)
m. Bef 14 May 1219
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 | William II de Ferrers, 4th Earl of Derby (1168-1247)
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 | Agnes de Meschines (1174-1247)
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| Agatha De Ferrers (1192- ) |
| Reginald Ferrers (1200-1247) |
| Sir Thomas de Ferrers, of Chartley (1202-1266) |
| Sir Hugh Ferrers (1204-1257) |
| Bertha Ferrers (1204-1280) |
| Sybil de Ferrers (1216-1273) |
| William Marshall, 4th Earl of Pembroke (1146-1219) |
| Isabel De Clare, Countess of Pembroke (1172-1220) |
| Margaret Marshall (1189- ) |
| Earl William Marshall (1190-1231) |
| Earl Richard Marshall (1191-1234) |
| Maud Marshall, Countess of Norfolk & Surrey (1192-1248)  |
| Lady Maud Matilda Marshal (1193-1248) |
| Richard Marshal (1194-1238) |
| Thomas Earl Pembroke Marshal Richard (1194-1238) |
| Eva Marshal (1194-1245) |
| Gilbert Marshal (1196-1241) |
| Gilbert Marshall, 4th Earl of Pembroke (1197-1241) |
| Walter Marshal,, 5th Earl of Pembroke (1199-1245) |
| Isabel Marshall (1200-1240) |
| Margerie Marshall (1200-1244) |
| Sir Walter Marshal, Knt (1200-1245) |
| Eva Marshal (1203-1245) |
| Anselm Marshall, 6th Earl of Pembroke (1208-1245) |
| Sybil Marshall, Countess of Derby (1209- ) |
| Joan Marshal (1210-1234) |
| William De Ferrers, III (1193-1254)
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| Sibyl Marshall (1201-1245)
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| Agnes de Ferrers (1222-1290) |
| Isabella de Ferrers (1226-1260) |
| Maud De Ferrers (1228-1299) |
| Lady Sibyl de Ferrers (1230-1273) |
| Joan de Ferrers, the Elder (1233-1267) |
| Agatha de Ferrers (1234-1306) |
| Eleanor de Ferrers (1236-1274) |