Rohese de Dover, Lady of Chilham - DOB for Rohese

Good morning,

It would appear that either the DOB for Rohese of 1186 or the DOB for her Mother Isabel de Briwere of 1184 are incorrect. My guess is that Isabel's DOB should be earlier to more closely correspond to the DOB of her husband at 1161.

Any help on this question would be appreciated.

John Love