Pharaoh
Etymology
Sometime during the era of the New Kingdom, Second Intermediate Period, pharaoh became the form of address for a person who was king. The earliest confirmed instance where pr ꜥꜣ is used specifically to address the ruler is in a letter to Akhenaten (reigned c. 1353–1336 BCE) which is addressed to "Great House, L, W, H, the Lord". However, there is a possibility that the title pr ꜥꜣ was applied to Thutmose III (c. 1479–1425 BCE), depending on whether an inscription on the Temple of Armant can be confirmed to refer to that king. During the Eighteenth Dynasty (16th to 14th centuries BCE) the title pharaoh was employed as a reverential designation of the ruler. About the late Twenty-first Dynasty (10th century BCE), however, instead of being used alone as before, it began to be added to the other titles before the ruler's name, and from the Twenty-Fifth Dynasty (eighth to seventh centuries BCE) it was, at least in ordinary usage, the only epithet prefixed to the royal appellative.
Pharaoh-5