The Mmrnmhrm were mechanical beings, that were churned out of the huge Mother-Ark about a millenia ago on some planet in the Virginis-constellation. The Mother-Ark was a huge factory ship sent from an unknown origin which created millions of sentient machines who called themselves "Mmrnmhrm". It then broke down.
In time the Mmrnmhrm met the Chenjesu and their co-operation and friendship became the foundation for the Alliance of Free Stars. After the Alliance lost to the Hierarchy in the First War, the Mmrnmhrm, along with the Chenjesu, asked to be encased within a slave shield on Procyon II.
During the First War, the Mmrnmhrm flew their adaptable X-Form starships.
The Mmrnmhrm are no more, having been synthesized with the Chenjesu to form a new hybrid race, the Chmmr, to fight against the Hierarchy. This was a logical solution for the Mmrnmhrm, as no more of their species could be made after the Mother-Ark shut down.