According to surviving sources Themistoclea was ’ teacher.

He had a teacher named Themistoclea, who introduced him to the principles of ethics
But back to Themistoclea. All we know is her name, her occupation (priestess at Delphi), and the approximate time she lived (6th century BCE). Presumably she was the Pythia: the Delphic priestess who was responsible for delivering the all-important oracles, possibly while in a shamanistic trance. The Greek vase painting above shows the Pythia seated on her bronze tripod, ready to deliver an oracle to the man who stands before her. The 19th century painting by John Collier is based on that vase, and on several details known from ancient Greek authors. He shows the fissure in the earth from which some sort of gas was said to escape, possibly helping to induce the Pythia’s trance state (though it didn’t affect anybody else); and he shows clearly the laurel leaves and bowl of water she held in her hands. It’s a great painting, though we’re not sure about that bare shoulder. As you’ll see below, the chiton was typically fastened on both shoulders.
IWSAF - Episode 15 - Themistoclea I
According to Herodotus, after the Persian navy began its maneuvers, Aristides arrived at the Allied camp from Aegina. Aristides had been recalled from exile along with the other ostracised Athenians on the order of Themistocles, so that Athens might be united against the Persians. Aristides told Themistocles that the Persian fleet had encircled the Allies, which greatly pleased Themistocles, as he now knew that the Persians had walked into his trap. The Allied commanders seem to have taken this news rather uncomplainingly, and Holland therefore suggests that they were party to Themistocles's ruse all along. Either way, the Allies prepared for battle, and Themistocles delivered a speech to the marines before they embarked on the ships. In the ensuing , the cramped conditions in the Straits hindered the much larger Persian navy, which became disarrayed, and the Allies took advantage to win a famous victory. Are you sure you want to view these Tweets? Viewing Tweets won't unblock @Themistoclea.@Themistoclea hasn't tweeted yet.Diodorus provides a rhetorical summary that reflects on Themistocles's achievements:
The early Pythagoreans consisted of women named Themistoclea, Theano, Arignote, Myia, and Damo. It is interesting to note that except for Themistoclea these women were all members of Pythagoreas' family. Myia (like other women philosophers of that time) felt the need to help and teach women things that they all must know in order to live a peaceful life. They felt it was their duty as women philosophers to help women create harmony within their households and life in general. After all, the first step to having a peaceful life is to have a peaceful home.[3] THEMISTOCLES (c. 514-449 B.C.), Athenian soldier and statesman in some respects probably the ablest and most farsighted whom Greece produced in the first ha]f of the sth century. He was the son of Neocles, an Athenian of no distinction and moderate means, his mother being a Carian or a Thracian Hence according to the Periclean law he would not have been a free Athenian at all (see PERICLES). Thucydides properly brings out the fact that, though he lacked that education which was the peculiar glory of the Periclean age, he displayed a marvellous power of analysing a complex situation together with a genius for rapid action. Plutarch similarly enlarges on his consuming ambition for power both personal and national, and the unscrupulous ability with which he pursued his ends. In all these points he is the antithesis of his great rival Aristides (q.v.). Of his early years little is known. He may have been strategus of his tribe at Marathon (FIut. Arist. 5) and we are told that he deeply envied the glory which Miltiades earned. At a~ events the death of Miltiades left the stage to Aristides and Themistocles. It is sufficiently clear that their rivalry, terminated in 483-82 by the ostracism of Aristides, turned largely on the fact that Themistoc:les was the advocate of a policy of naval expansion. This policy was ~nquestionably of the highest importance to Athens and indeed to Greece. Athens was faced by the equal if not superior power of Aegina, while the danger of a renewed Persian invasion loomed large on the horizon. Themistocles therefore persuaded his countrymen to put in hand the building of 200 triremes, and --what was of even greater importance-to fortify the three natural harbours of Peiraeus (see E. Gardner, Ancient Athens, 562 f.) in place of the open roadstead of Phalerum. For the building of the ships Themistocles persuaded the Athenians to allocate 100 talents obtained from the new silver mines at Laurium (Ath. (I0 drachmae each). One hundred of the propose~ 200 were built. 1 Mary Ellen Waithe, "Early Pythagoreans: Themistoclea, Theano, Arignote, Myia, and Damo," A History of Women Philosophers: Volume 1/600 BC - 500 AD (Netherlands: Dordrecht/ Boston/ London, 1987),11. After the crisis of the Persian invasion Themistocles and Aristides appear to have composed their differences. But Themistocles soon began to lose the confidence of the people, partly owing to his boastfulness (it is said that he built near his own house a sanctuary to Artemis Aristoboule "of good councel") and partly to his alledged readiness to both refer to some accusation levelled against him,1 and some time between 476 and 471 he was ostracized. He retired to Argos, but the Spartans further accused him of treasonable intrigues with Persia, and he fled to Corcyra, thence to Admetus, king of the Molossians, and finally to Asia Minor. He was proclaimed a traitor at Athens and his property was confiscated, though his friends saved him some portion of it. He was well received by the Persians and was allowed to settle in Magnesia on the Maeander. The revenues (50 talents) of this town were assigned to him for bread, those of Myus for condiments, those of Lampsacus for wine. He died at Magnesia at the age of sixtyfive, and a splendid memorial was raised by the people of the town, though it is said that his bones were secretly transferred to Attica. He was worshipped by the Magnesians as a god, as we find from a coin on which he is shown with a patera in his hand and a slain bull at his feet (hence perhaps the legend that he died from drinking bull's blood: cf. Aristoph. Eq. 83, Diod. xi. 58; Plut. Them. 3I).