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These Testimonia are ancient reports about Cratylus, an Athenian philosopher of the late fifth century BC, collected by Diels and Kranz. No writings of his survive. The passages come chiefly from Plato's dialogue Cratylus, in which he defends the natural correctness of names, and from Aristotle, who says that Plato knew Cratylus and his Heraclitean views in his youth and that Cratylus ended by merely moving his finger.
Cratylus is remembered as a radical follower of Heraclitus who carried the doctrine of flux to the conclusion that nothing can truly be said, correcting his master by claiming one could not step into the same river even once. Through Plato's dialogue, he became a lasting figure in the philosophy of language and the debate over whether names are natural or conventional.
About this edition. The Greek text comes from the Eulogikon open corpus of public-domain editions (standard reference: DK 65 A). Every word has been analyzed with odyCy, a neural language model for Ancient Greek — click or tap any word for its dictionary form, part of speech, and complete morphology, together with the full entry from the Liddell–Scott–Jones Greek–English Lexicon (LSJ).