Many thousands of yahrens ago, on the planet Cylon, there evolved a race of reptilian creatures. These repiles quickly became the dominant species on their planet, and quite quickly became techhnologicaly advanced. They developed space flight and soon started exploring the galaxy.

The Cylon race was a very specifically ordered society, and to them, everything has to have a place and a reason within this ordered society. As such, they did not see eye to eye with most of the races they contacted, and if they were not before, they became an agressive society, although they would see this as act of survival against a chaotic universe, rather than a need to dominate.

To help them in their role of ordering the galaxy, they started changing their bodies as they found that the bipedal form was the most practical, and then they started augmenting their bodies with cybernectic attachments to make them stronger, live longer and be more able. As the yahrens progressed, the Cylons augmented more and more of their bodies.

Around a thousand yahrens ago (just before the onset of the Thousand Yahren war), the Cylons were visited by Count Iblis. What happened next is not known, probably not even to the Cylons, but with the help of Count Iblis, the reptilian race made the leap from being biological to purely mechanical. Again, whether this was a move the Cylons had intended to go down or whether or not they were tricked into it by Count Iblis, no one knows. The original Cylon race thus died out, and in it is place the new robotic Cylon race ventured forth. How much influence on this race Count Iblis had is not known, but at some point he must have had some influence on at least one Cylon as the voice of the robotic imperious Leader is actually the transcribe voice of Count Iblis. Whether he managed other changes is also not known. It is known that the robotic Cylons do not follow Count Iblis, and it may be that the leap to robotics was a move influenced by Count Iblis when the reptilian Cylons also refused to follow him.

There were no wars, no exterminations, no organic versus mechanical conflicts, the Cylons "simply" transformed into robotic Cylons. Whether they died out, left the Galaxy or whatever, is not known.

These Cylons took on the task that their biological brethran had left them, and thus took over the running of the old Empire. With the transition to being fully machine, Cylon society took a few turns. Now it was possible to program Cylons to perform certain tasks, order could be established and routine and structure enforced. At the same time, they also become more single minded in their mission as galactic caretakers.

It appears likely that the Hasaris were one of the first races 'contacted' by the Cylons.