The Southampton Plot

People in England during the reign of Henry V were still trying to use Edmund Mortimer as a focal point for a rebellion. Edmund's sister, Anne Mortimer, had married the 3rd Earl of Cambridge, Richard of Conisburgh. Richard was also a descendant of Edward III. Richard's daughter, Isabel, was betrothed to Thomas, the son of Sir Thomas Grey (Isabel was three years old, Thomas was eight, and there's…