sentences:  After the conquest these sub-divisions of the country became known as counties.There were some changes in the number and boundaries of the counties in the 11th to 13th centuries, but by the time the representatives from them (known as Knights of the Shire) were summoned to attend Parliaments from the 13th century, the list of the historic counties was fixed.The two Palatine counties of Cheshire and Durham were not represented until the sixteenth and seventeenth centuries respectively, but the other historic counties each returned two county members.