I have recently read that we have very few informations about the roman kings. Their chronology has some flaws, and the facts often are mixed with some myths. And the notable historians who wrote about them lived much later. Do we have any reliable information about their existence and their actions ?
I asked the same question here a few years ago, you might be interested in the answers.
Edit: I'll just ping the users in case they want to add or clarify anything. Answers were by /u/rock_the_cat-spa and /u/BaffledPlato