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No surviving ancient histories describe Hellenic civilization preceding the Greek Dark Ages except for anecdotes relating to Homeric characters— and scholars are not even sure whether the Achæans can be identified as the Mycenaeans or not.
What we know of Mycenaean civilization is almost entirely from the archeological record, and if Homeric stories are accepted, from oral tradition.
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In late 5th century BC Mycenae looked small and insignificant in the words of Thucydides I.10, as did all other cities of that age. (Καὶ ὅτι μὲν Μυκῆναι μικρὸν ἦν, ἢ εἴ τι τῶν τότε πόλισμα νῦν μὴ ἀξιόχρεων δοκεῖ εἶναι)
The Mycenaeans are recorded to have taken part in the Persian Wars on the side of the Hellenic League. Herodotus 9.28.4 mentions that Mycenae along with Tirynth fielded 400 men at the battle of Plataea (τούτων δὲ Μυκηναίων καὶ Τιρυνθίων τετρακόσιοι), which is solidly corroborated by the fact that Mycenae (MVKANEΣ) is inscribed on the Serpentine Column that was dedicated after the Greek victory at Plataea to Apollo in Delphi (5th loop from the bottom, 1st name).
The military contribution of the Myceneans in the Persian wars is attested also by the 2nd century AD traveler Pausanias, 2.16.5, who mentions that Mycenae was eventually destroyed by Argos out of jealousy, because the Argives had taken no action during the Persian invasion by Xerxes, whereas the Myceneans had sent 80 men to fight along with the Spartans at Thermopylae. (Μυκηναῖοι πέμπουσιν ἐς Θερμοπύλας ὀγδοήκοντα ἄνδρας, οἳ Λακεδαιμονίοις μετέσχον τοῦ ἔργου). The small size of the forces contributed by Mycenae at Thermopylae and in Plataea is in line with Thucydides’ description of classical Mycenae as insignificant at the time.
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The best and most reliable Ancient Greek writer who identified and commented on Mycenae.......was Homer and "The Iliad".
Although Homer is not viewed as a Historian and "The Iliad" has often been viewed as the foundation of Western Literature and "Mythology", in reality, "The Iliad", was more of a historical commentary, a type of poetic retrospective sung by the blind Poet Homer, while playing his Lyre/(or Ancient Guitar) on the Aegean island of Chios.
Keep in mind that the content of the "The Iliad" was not necessarily invented by Homer, but rather, a culmination of centuries told tales passed from generation to generation regarding the actual Trojan War from the 1190's BC/BCE. When Homer arrived on the historical scene, it is approximately 400 years since The Trojan War. The generational story of The Trojan War, was rooted in a historical event and the city of Mycenae, was an actual city that Homer and the Greeks of his generation knew of.
Remember, one of the central characters of "The Iliad", Agamemnon, was the King of Mycenae and his brother, Menelaus, was the King of Sparta and married to Helen, "Queen of Sparta"-(before she became, "Helen, Queen of Troy"). In other words, the Ancient Greeks, long after the Trojan War, were well aware of the historical and geographical existence of Mycenae. It was not a city shrouded in myth and legend. Even with the archaeological excavations of Heinrich Schliemann, as well as the subsequent translations of the Linear B tablets by Michael Ventris, the Ancient Greeks were well aware of an actual Mycenae-(and perhaps even beyond the Ancient Greeks).
So your best historical reference with regard to the historical origins of Mycenae, comes from a historically sentimental Greek Poet and Singer from 2800 years ago.