(some sources distinguish between mythology and legends; for the purpose of this question, I'm asking about narrations about human beings. For example stories of everyday human beings, genealogies of kings etc.
What is the role of and legend as historical sources?
There are lists of kings and genealogies of the past in mythological works. Although not supported by rigorous documentation, they offer a glimpse of some of the powerful rulers present at that time or the names which are collected by the author. For example, author Shri Veda Vyasa mentions various kings, names of their kingdoms and geographical locations etc. in the epic Mahabharata, which is considered as Itihasa or history.
Even if there is insufficient supporting evidence to conclude that the lists are accurate, is it possible to form and test inferences based on these legends? Can they be treated similar to oral histories and other non-textual sources?
I am interested to find out that to what extend such listings of kings or rulers are considered valid and correct in order to ascertain history of particular region (not only of India but in general ) by historians? Do historians consider them as authentic.?