Egypt - Timeline

The title "pharaoh" is used for those rulers of Ancient Egypt who ruled after the unification of Upper and Lower Egypt by Narmer during the Early Dynastic Period, approximately 3100 BC. 

~2,650 BC Djoser commissions the first Pyramid in Egypt, chief architect/scribe is Imhotep

However, the specific title of Pharaoh was not used to address the kings of Egypt by their contemporaries until the New Kingdom's Eighteenth Dynasty, c. 1400 BC. 

Along with the title pharaoh for later rulers (>1,400 bC), there was an Ancient Egyptian royal titulary used by Egyptian kings featuring a Horus name, a Sedge and Bee (nswt-bjtj)

Egypt was governed by native pharaohs for approximately 2500 years, until it was conquered by the Kingdom of Kush in the late 8th century BC, who were then conquered by the Achaemenid Empire, who were also conqured by  Alexander the Great in 332 BC...