The earldom of Mercia was abolished around this time, and the Earldom of Chester (roughly co-terminus with the combined areas of Cheshire and Flintshire) was established. The earldom was sufficiently independent from the kingdom of England that the 13th-century Magna Carta did not apply to the shire of Chester, so the earl wrote up his own Chester Charter at the petition of his barons | The earldom of Mercia was abolished around this time, and the Earldom of Chester (roughly co-terminus with the combined areas of Cheshire and Flintshire) was established. The earldom was sufficiently independent from the kingdom of England that the 13th-century Magna Carta did not apply to the shire of Chester, so the earl wrote up his own Chester Charter at the petition of his barons |