This Datacron unlocks the codex entry - Galactic History 24: Empress Teta
This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:
The Republic had enjoyed a long period of peace during the Manderon Period, but the Koros system was rapidly becoming a problem. Although the planet Koros Major was stable, growing wealthy on carbonite exports, the other six worlds of the system were poor and increasingly lawless.
The task of uniting the Koros system was accepted by a noble famed for her military achievements. Empress Teta was the heir to Koros Major and was determined that the rest of the Koros system would share its prosperity. To that end, Teta began the Unification Wars, hoping to bring the entire system under her rule. She was ultimately successful, though she had to fight a long and bloody campaign to conquer the planet Kirrek.
Empress Teta would become known as one of the Republic's boldest commanders. The Koros system was eventually renamed after her.
This Datacron is located in the Tularan Marsh near Swoop Raceway. To reach this Datacron you will need to start up a damaged pipe around the coordinates (Screenshots 1 & 2). At the top of the damaged pipe you will want to jump onto the broken platform off to the left hand side (Screenshot 3). Run across this broken down platform all the way across to the southern end where you'll be able to jump across to a ledge next to a large wall (Screenshot 4). If you're confused as to what I mean I am looking right at the area in Screenshot 4.
From the platform I am facing in Screenshot 4 you need to jump down to the large surface area to the south. From here run southwest all the way across until you reach another platform at the end of this long one (Screenshot 5). If you're confused at all of where I am right now, take a look at (Screenshot 6). I can see the Datacron from where I am standing and the platform in Screenshot 5, the one we're going to next, is off to my left. If you know where you are now, let's continue towards that Datacron!
What you need to do now is jump across from platform to platform in the southwestern general direction. Once you reach the very end of the platforms you will want to turn right and start jumping across the rubble in a northwesternly direction (Screenshot 7). From here on out the path you will be taking to the Datacron is laid out before you. You really can't get lost.