An Egyptian (of General Antefs) stele, ca 2050 f.Kr, 11th dynasty, probably under the reign of Mentu-hotep II.
"The Egyptians, in their animal-pictures, were the first people to represent thought by symbols: these, the earliest documents of human history, are visible to‑day, impressed upon stone. They describe themselves also as the inventors of the alphabet: from Egypt, they consider, the Phoenicians, who were predominant at sea, imported the knowledge into Greece, and gained the credit of discovering what they had borrowed. For the tradition runs that it was Cadmus, arriving with a Phoenician fleet, who taught the art to the still uncivilized Greek peoples."
Tacitus - Annals XI 14
Translated by J. Jackson