- According to ancient protoss texts, the xel'naga, an extra-galactic race obsessed with the seeding of life, arrived in the Milky Way galaxy tens of millions of years ago, establishing their domain and seeding life on various worlds. Aiur is one such example, giving rise to the protoss.
- Around 200,000 BCE, modern humans arise on Earth, seemingly without any influence from the xel'naga. Millenia later, despite faulty and limited data on their history, the terrans of the Koprulu Sector possess information on this early period of human development.
- Frustrated with their failure to create a species with distinct "purity of form", the xel'naga turn their attention to Aiur. Pleased with the progress of its dominant species, the xel'naga name them the protoss ("Firstborn") and commence observation which lasts hundreds of protoss generations.
- Eventually, frustrated at the slow rate of protoss evolution, the xel'naga subtlely guide their development for a millenium, leading them to the state of total sentience and awareness. Exhilarated, the xel'naga make themselves known to their creations.
- Protoss civilization spreads across Aiur within a few thousand years. However, as more emphasis is placed on individual achievement than communal advancement, the protoss begin to revert to tribalism. Distrust of the xel'naga begins to brew, and the protoss cut off their psychic link.
- The xel'naga depart from Aiur, seeing the protoss as a failed creation. Disheartened at their departure, the protoss tribes turn on each other, each blaming their counterparts for their mentors’ departure. Thus begins the Aeon of Strife.
- The protoss having failed them, the xel'naga head for the planet Zerus. Seeking to create a species with a distinct Purity of Essence, they begin developing the race of miniature insectoids known as the zerg. Attempting to waylay the potential hazards of competing egos, they create the Overmind -- a collected zerg sentience.
These events occur before the xel'naga encounter the protoss, but their timing in regards to each other is unclear.
- A disaster strikes Xil, wiping out its native ecology overnight. The xel'naga abandon the planet. Millions of years later, it has yet to recover.
- A sapient alien species develops a civilization on Helios. However, it drives itself to extinction, courtesy of a war fought over a khaydarin crystal.
- The xel'naga discover/create the Argus Stone, holding it in high regard for its immense power. Their scholars meanwhile indirectly predict the events of the Great War.
- The xel'naga imprison a Void-based entity using an Argus crystal on a barren planet orbiting KL-2.
|The next article in this series is 500 B.C.E.|
The list of authors can be seen in the page history of Human.
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