The Reptilen Empire was formed at the end of the federation wars. With the destruction of several small groups, The Reptilen Republic failed to take back systems that had been taken from them. Before the War, the Republic had control of 65% of the known galaxy, now they only had control of 48%. When the War ended a Reptilen Named Sh-almun the 5th reached out to Reptilien worlds under control of others besides Humans, He asked for a revolution. In response, over 10,000 worlds that were taken from the Republic were taken back.