Robert de Ferrers, 6th Earl of Derby
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| PARENT (M) William de Ferrers, 5th Earl of Derby | |||
| Birth | |||
| Death | |||
| Marriage | to Sibyl Marshal | ||
| Marriage | to Margaret de Quincy | ||
| Father | William de Ferrers, 4th Earl of Derby | ||
| Mother | Agnes De Kevelioch | ||
| PARENT (F) Margaret de Quincy | |||
| Birth | |||
| Death | |||
| Marriage | to William de Ferrers, 5th Earl of Derby | ||
| Father | Roger de Quincy | ||
| Mother | Ellen of Galloway | ||
| CHILDREN | |||
| M | Robert de Ferrers, 6th Earl of Derby | ||
| Birth | |||
| Death | |||
| Marriage | to Alianore de Bohun | ||
| F | Joan de Ferrers | ||
| Birth | |||
| Death | 19 MAR 1309 | ||
| Marriage | to Thomas de Berkeley, 1st Baron Berkeley Knight | ||
| PARENT (M) Robert de Ferrers, 6th Earl of Derby | |||
| Birth | |||
| Death | |||
| Marriage | to Alianore de Bohun | ||
| Father | William de Ferrers, 5th Earl of Derby | ||
| Mother | Margaret de Quincy | ||
| PARENT (F) Alianore de Bohun | |||
| Birth | |||
| Death | |||
| Marriage | to Robert de Ferrers, 6th Earl of Derby | ||
| Father | Humphrey de Bohun | ||
| Mother | Eleanor de Braose | ||
| CHILDREN | |||
| M | John de Ferrers, 1st Baron Ferrers of Chartley | ||
| Birth | |||
| Death | |||
| Marriage | to Hawise (Hawyse) de Muscegros | ||