Lucasfilm added Dawn of the Jedi to its official era chart as the first and oldest bucket, and then left it nearly empty. That is the honest state of this shelf: it is the era with the most mythic weight and the least actual reading, and any guide that tells you otherwise is selling you a Legends comic omnibus without mentioning that it was decanonised in 2014.
The Je’daii
What exists — and it is genuinely good — is John Ostrander and Jan Duursema's Dawn of the Jedi, a Dark Horse comic series published between 2012 and 2014 and set principally in 25,793 BBY. It is the earliest-set Star Wars story ever published. Its subject is the Je’daii Order on Tython, a Deep Core world orbited by two moons, Ashla and Bogan, whose pull the Je’daii read as a physical expression of the Force's two faces.
The name is the point. Je’daii is given as a Dai Bendu compound — je, mystic; daii, centre — later worn down into Jedi. And the philosophy is not the one the films taught you. A Je’daii who drifted too far toward either moon was sent to the other to correct, because balance meant standing between the two rather than choosing one. Watching that idea die is the whole arc.
What broke it
Two things, in the comics' telling. First the Despot War of 25,805 BBY, in which the conqueror Queen Hadiya threw an army at Tython and lost — but taught the Je’daii what organised violence looked like. Then, twelve years later, the arrival of Xesh: a Force Hound of the Rakatan Infinite Empire, a slave weapon trained to hunt Force-rich worlds, who brings both the concept of the lightsaber and the concept of a Force used purely as an instrument of domination. The Force War that follows is where balance stops being an option and the Order fractions into the two traditions the rest of the saga will spend twenty-five thousand years fighting about.
Canon, Legends, and an empty shelf
Every Je’daii story above is Legends. It is not in current continuity and, at time of writing, nothing has replaced it: canon acknowledges that the Republic and the Jedi are roughly twenty-five millennia old and declines to elaborate. Lucasfilm did announce a film exploring the origins of the Jedi at Star Wars Celebration in 2023; this site does not speculate about release dates or content, and will not report a project as a fact until it is one.
What to do about it
If you are reading in publication order, skip this era and come back. If you are reading chronologically and you want the ancient material, accept that you are reading Legends and read it as Legends — a separate, complete, closed continuity with its own internal logic. That is not a consolation prize. It is arguably the most interesting philosophical material in the entire franchise, and it exists precisely because nobody in 2012 expected it to matter to anything.
The next stop chronologically is The Old Republic, which is where the schisms this era set up finally produce the Sith.