who were the anunnaki ?
The oldest civilization on the Earth, civilization in the sense of having left behind considerable traces of their having been here, constructions, marking, paintings and other such physical traces, has to be the Mesopotamians, the Sumer civilization. Located in what is now the territory of Iraq.
This civilization has left behind writings on stone tablets and walls, which if they are not fictional, would suggest that the Earth had began 450.000 years ago, after the collision two smaller planets. Unfortunately, this date would not have allowed the Earth the time to reach its current state, as many scientists believe, so, in order to still make sense of this theory, one has to go back a longer time in the past.
At any rate, one of the Planets was Nibiru, the other one was known as Tiamet. The collision had formed the Earth as we know it today, and also the Moon and a number of comets. A race of extraterrestrials known as the Annunaki came to the newly formed Earth in search for precious metals and other resources, as they believed that the impact had brought important resources closer to the surface of the Earth.
Homo Erectus was constructed from the DNA of this particular race, most probably to be used as slaves to aid in the harvest of resources of these aliens. When the particular type of resource they were after was depleted they left the planet, but allowed the race they created to exist. Our modern day humans are thus a development of these creatures from the past, creatures which are thus created by aliens, the Annunaki.
Along with the materials that were written by the Sumerians, recounting these stories, the bible also mentions these creatures, as much more developed than us both physically and mentally ( judging by their technology) and as being our forefathers.