Roger Mortimer and Edward II's queen Isabella had successfully rebelled against Edward who they eventually deposed, you can see them depicted in the image below. History states that Edward II died at Berkeley Castle towards the end of the summer of 1327 supposedly on the order of Roger Mortimer, however it has been suggested that he lived a number of years abroad. With Edward gone Mortimer and Isabella were criticised for the way they conducted themselves, their attempted overthrow of Edward III was a step too far.
Isabella was returned to Berkhamsted Castle in Hertfordshire and then to Windsor Castle. In 1332 she was sent to her own property of Castle Rising in Norfolk where she is thought to have suffered a nervous breakdown.