Known rulers, in the History of Egypt, for the Thirteenth Dynasty (from about 1800 BCE) The Eleventh (all of Egypt), Twelfth, Thirteenth and Fourteenth Dynasties of ancient Egypt are often combined under the group title, Middle Kingdom. In later texts, this dynasty is usually described an era of chaos and disorder. However the period may have been more peaceful than was once thought. The dynasty was eventually overthrown by the Hyksos.