Antisthenes

Overcome by the importunity of Diogenes, Antisthenes yielded, and permitted him to become his scholar.
Great Men and Famous Women. Vol. 3 of 8|Various
Errors of Antisthenes — depended partly on the imperfect formal logic of that day.
Plato and the Other Companions of Sokrates, 3rd ed. Volume III (of 4)|George Grote
Antisthenes 222probably considered that the copula implied identity between the predicate and the subject.
Plato and the Other Companions of Sokrates, 3rd ed. Volume III (of 4)|George Grote
This last opinion is said to have been held by Antisthenes, one of the disciples of Sokrates.
Plato and the Other Companions of Sokrates, 3rd ed. Volume III (of 4)|George Grote

Here again, we have difficulties similar to those which perplexed Antisthenes.
Plato and the Other Companions of Sokrates, 3rd ed. Volume III (of 4)|George Grote

British Dictionary definitions for Antisthenes

Antisthenes

/ (ænˈtɪsθəˌniːz) /

noun

?445–365 bc, Greek philosopher, founder of the Cynic school, who taught that the only good was virtue, won by self-control and independence from worldly needs

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