The "Aegyptiaca", the "History of Egypt", may have been Manetho's largest work. It was in date order and divided into three volumes. In "Aegyptiaca", he invented the word "dynasty" to mean a group of kings with a common origin. It came from the Greek word "dynasteia", meaning "governmental power". He was the first person to group the rulers into dynasties. He did not use the word to mean families. He began a new dynasty when there was a break or change in the power of government. For example, there was a break between the Fourth Dynasty in Memphis, and the Fifth Dynasty at Elephantine. He included details of many of the kings.