Pyramid carbon dating
The debate over when the Giza complex was constructed is still ongoing.
To give just one example, Syncellus, who copied Africanus' list, wrote, "The twenty-fourth dynasty, Bocchoris of Sais, for six years: in his reign a lamb spoke [a short gap in the manuscript] 990 years." Meanwhile Eusebius wrote, "Bocchoris of Sais for 44 years: in his reign a lamb spoke.
For those dynasties which left us almost nothing, like VII-X and XIV, Manetho is considered the most reliable authority, even though the lack of evidence has caused some to ask if those dynasties really existed.
This may be why Sir Alan Gardiner wrote that 'what is proudly advertised as Egyptian history is merely a collection of rags and tatters'.
While most sites are adorned with inundations of praise to the builder of the structures, unfortunately, the Giza complex is devoid of such engravings or inscriptions (exceptions discussed earlier).
In itself, the absence of information is significant.Because of the poor condition, piecing the fragments together has proven to be difficult.