…of the time (e.g. medieval and ancient) that historians today aren't sure actually happened?.
"Most textbooks on the history of Archaic Greece prominently feature the Battle of Hysiae, in 669 BC. Supposedly, this was the first battle in which hoplites fought in a phalanx formation; the brilliant tactical innovation of Pheidon of Argos allowed the Argives to inflict a crushing defeat on the Spartans.
This is a very neat story. Unfortunately, it is based on practically nothing.
First, the battle of Hysiae is mentioned only by a single source: the travel writer Pausanias (2.24.7). He was not a historian, and his work dates to the 2nd century AD. That is to say, our only evidence for this battle comes from an uncritical source written eight hundred years after it supposedly happened. No other author, including historians like Herodotos who wrote extensively about the rise of Sparta, has anything to say about Hysiae.
Second, Pausanias does not tell us who was king of Sparta or Argos at the time, so it is very poorly grounded in what little else we know about the period. The year 669 BC is derived from a dialect reading of an Olympic victor's name mentioned by another author. However, Pausanias himself tells us that the Spartans were busy battling the Messenian Revolt at this time; it is unlikely that they would have their hands free for a major war, and even more unlikely that they would have fought such a war with Argos, whose territory lay beyond Sparta's still hostile neighbour, Tegea. Pausanias, then, probably didn't record a serious historical tradition. In all likelihood, he was told some garbled tale by his Argive guides, who had themselves forgotten the origin of a particular mass grave in their territory…"
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If the answer is right…Are there someone in Medieval Times?
Amicalement
Armand