Earth

Earth, R'gh-'yeh, The Great Blue Gem, the third planet from the Sun, and the densest planet, and it was settled by the Yagathians.

History
Earth formed approximately 4.54 billion years ago, and life appeared on its surface within its first billion years.

Then Earth was colonized by the Yagathian Empire 900 million years ago and they were the first race of extraterrestrials to ever populate an entire world in a couple of million years.

They created the first living organisms on the planet and also brought on many extinctions and epochs to suit their civilization by disrupting the natural order of the ecosystems.

However, the Yagathians waged wars against each other for control over the "Forbidden Knowledge" and this caused many lives to be lost and also the downfall of great cities on the surface of the Earth killing millions of lives in the process.