Pre-Republic era

pre-Republic is the name of the (more or less) 'prehistoric' period before the formation of the Galactic Republic; that means a period that ends as far back as more than 25,000 years ago.

That era saw the formation and evolution of all the species of the Galaxy, the dawn of their civilisations and the first development of their space travels.

The pre-Republic history was largely formed by ancient and mysterious species who had already developped interstellar travel long before the humans and other well-known and recorded species. Those beings, collectivelly known later as Celestials, Architects, had formed so advanced technology that they created space megastructures and could terraform or even move planets.

Such a race was the Rakata who formed the Infinite Empire, the first known Galaxy-spanning political entity.

Lore
The Galactic civilizaton, being more ancient than 25,000 old, although interested scientifically for events and facts of the ultimate past, has difficulty infering them from study. Questions as the original planet of humanity remain unanswered, the candidate planets, such as Coruscant being so technologically expanded and modified that make all traces obsolete.