The earliest mention of Shemay came from the three Coptos Decrees “g” to “i” which are generally attributed to pharaoh Neferkaure, and one of these is datable to his Year 4. These documents were displayed in the temple of Min at Coptos and were addressed to the Governor of Upper Egypt Shemay – who had been nomarch of the Two Falcons nome with Coptos as capital – and concerning administrative matters about the cult of pharaoh Pepi II and the temple of Min. The earliest of the three decrees mention the new nomarch of Coptos named Idy who very likely was the same person of Idy, son of Shemay; furthermore, the latest of the three decrees ensured to Shemay the responsibility over the 22 nomes of Upper Egypt.[3]
Shortly after, king Neferkaure was succeeded by Neferkauhor and Shemay managed to marry his eldest daughter, princess Nebyet; in a single day of his Year 1 (possibly in the same day of his accession to the throne, the "Month 2 of Peret, Day 20"[1][8]) Neferkauhor promulgated 8 of the Coptos Decrees (“j” to “q”), the beneficiary of which was always the newly promoted vizier Shemay as well as various member of his family.[2]
The first decree concerned Nebyet's particular status — as well as Shemay's one, for being the son-in-law of the new pharaoh. Subsequent decrees established other new benefits for Shemay's sons: Idy again filled the vacuum left by his father, occupying the office of Governor of Upper Egypt (although he was responsible only of the 7 southernmost nomes of Upper Egypt[9]) while another son earned a title in the temple of Min.[1] Shemay and Nebyet also gained some privilege that were unprecedented for non-royal people: in fact, some priests were assigned to the funerary cult of their ka, and the couple was allowed to make their own mortuary monuments from royal-exclusively red granite.[3]
It seems that Shemay was already deceased when the last of the Coptos Decrees (“r”) was issued by the Horus Djemedjibtawy, who has been tentatively identified with both Wadjkare and Neferirkare: in fact it was addressed to the vizier Idy,[1] providing evidence that once again the son followed his father's footsteps.[3]
In life, he gathered an impressive number of titles and offices, in a decree he is called "...the god's father, beloved of god, king's (foster) child, pyramid-town overseer and vizier, overseer of scribes of the king's document, governor of Upper Egypt, sole companion, chamberlain, herdsman of Hierakonpolis, chief of El Kab, lector priest, overseer of the priest of Min".[10] Further high titles are found in his tomb iry-pat (hereditary prince) and Haty-a (count).[4]