An Old Egyptian historical Argument

In the autobiographical part of his tomb inscription, Vizier Senedjemib Inti of the Fifth Dynasty of Egypt, who worked under Pharao Djedkare Isesi, writes:

When it came to pass [Register 4] his majest caused that I be annointed with fat [by the side of his majesty] [Register 5] [Neve]r [was done] the like by the side of the king for anyone. [Register 6] -- James H. Breasted, Ancient Records of Egypt, Vol 1, #270, p.122.

Given the dating of the Fifth Dynasty, that would put the record between the late 25th and the mid 24th century BC; see here for some of the proposed dates of Djedkare Isesi's reign.