One of the most difficult things to keep straight about ancient Egypt is its dynastic chronologies, thirty-three families of rulers over thousands of years, full of contradictions, inaccuracies, and outright lies. To offer some assistance I have included an incomplete list of the important dynasties, with a few details about each period; relevant Pharaohs, important events and so forth, from Wilkinson's timeline.
First Dynasty. c.2950-c.2750 BCE
The unification of Upper and Lower Egypt.
Third Dynasty, c.2650-c.2575 BCE
Notable for the construction of the Step Pyramid of Djoser, one of the first pyramids.
Fourth Dynasty, c.2575-c.2450 BCE
The apex of the pyramid age; construction of the Great Pyramid and the Sphinx.
The Seventh Dynasty
Never happened, chalk it up to creative bookkeeping.
The Eleventh Dynasty, c.2080- c.1938 BCE
Egypt's first major civil conflict, a period of great religious as well as political strife, as the Pharaoh's religious mandate ...