Thoth & the Invention of Writing
The ibis-headed god who gave Egypt writing — and kept the minutes at the judgment of the dead.
Also: Thoth · Djehuty · Tehuti · Dhwty · god of writing · scribe of the gods · Hermopolis · ibis god
Egyptians credited the god Thoth (Djehuty) with writing, counting, knowledge, and the regulation of time, and made him the patron of scribes and the recorder among the gods — for instance, noting the verdict at the weighing of the heart. Associated with the ibis and the baboon and with the moon, he was honored at Hermopolis. Later Greeks identified him with Hermes, which fed the much later Hermetic tradition (a Greco-Roman development, not pharaonic).
In short
Thoth (Djehuty), the ibis- and baboon-associated god of writing, knowledge, reckoning, time, and the moon — patron of scribes, scribe of the gods, and in tradition the source of script and learning.
Where it’s found
Pyramid Texts onward; judgment scenes (Book of the Dead spell 125); Hermopolitan cult
How the idea developed across Egypt
Thoth's scribal and lunar character is attested from the Old Kingdom; his prominence (and the Hermopolis cult) grows through the New Kingdom and Late Period. The Greek equation Thoth = Hermes (hence 'Hermes Trismegistus' and the Hermetica) is a Greco-Roman, late-antique syncretism, NOT ancient Egyptian.
Thoth is a deity (never a person). Hermes Trismegistus / the Hermetica are Greco-Roman syncretism and must NOT be filed as pharaonic Egyptian wisdom. The myth of Thoth and the invention of writing in Plato's 'Phaedrus' (Theuth) is a Greek literary reception — confirm with Dickus before any cross-stream use.