Reliable historical information about individuals and events generally relies on three-generation call back. Having access to testimony from eyewitnesses, people who know the eyewitnesses, or people who knew the people who knew the eyewitnesses only persists for about 120 years, or through the lifespans of three generations.
Histories by Herodotus was composed about 50-60 years after the events of the Greco-Persian wars, when Herodotus was still able to interview surviving veterans, or people who knew the veterans of the wars.
The Analects of Confucious was composed either by students of Confucious, or by students of his students, so it falls within the window of reliable oral tradition about Confucious.
The stories of King Arthur have a very tenuous and loose connection to a British war chieftan who fought the Anglo-Saxon invaders in the 6th century. The King Arthur tales were composed more than 500 years after this individual lived, making them obviously a legendary genre of writing.
Histories by Herodotus was composed about 50-60 years after the events of the Greco-Persian wars, when Herodotus was still able to interview surviving veterans, or people who knew the veterans of the wars.
The Analects of Confucious was composed either by students of Confucious, or by students of his students, so it falls within the window of reliable oral tradition about Confucious.
The stories of King Arthur have a very tenuous and loose connection to a British war chieftan who fought the Anglo-Saxon invaders in the 6th century. The King Arthur tales were composed more than 500 years after this individual lived, making them obviously a legendary genre of writing.