Agnes had siblings:
Agnes married William de Ferrers in 1192 at Cheshire, England. Agnes and William had children:
Agnes, Lady of Chartley, died 28 October or 2 November 1247 at Tutbury, Staffordshire, England.
"Henry III on 18 October, 1229, granted all the land between Ribble and Mersey, including the vill of West Derby with the wapentake and the forest, the borough of Liverpool, the vill of Salford with the wapentake, and the wapentake of Leyland, to Ranulf, earl of Chester and Lincoln, to hold in fee by rendering yearly at Michaelmas a mewed goshawk or 40s. (fn. 14) The assized rent of the demesne, with the service of the tenants holding in thegnage and at fee farm, and sake fee of the military tenants within the hundred, then amounted to £46 16s. 2d. (fn. 15) Upon the earl's death, in 1232, without issue this fee descended to William de Ferrers, earl of Derby, in right of Agnes his wife, one of the sisters and co-heirs of the earl of Chester. (fn. 16)
"The earl died in 1247, (fn. 19) having predeceased his wife but a few weeks. That he was the builder of Liverpool Castle may be inferred from writs of 19 January, 1235, for an aid to be made to him for the strengthening of his castle of Liverpool, (fn. 20) and of 10 November, 1247, directed to the escheator beyond Trent to deliver to William de Ferrers the lands which had been Agnes de Ferrers', and the castles of West Derby and Liverpool. (fn. 21)" 
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On 5 Jun 2019 at 05:44 GMT Isaac Taylor wrote:
Do we have individual sources for the various names floating around: Agnes, Alice and Beatrix?
On 6 Jun 2017 at 17:08 GMT Anonymous (Holland) Carroll wrote: