A long-dead people who were once under siege by the Goa'uld. The Velonans, unable to defend themselves, found aid in the Ancient Orlin, who took pity on the race and gave them the plans they needed to develop an Ancient space weapon from Velonan components.
The Velonans were successful at repelling the Goa'uld threat, and celebrated their victory. However, it was not long after when they began developing plans to use the technology to conquer other worlds. For this act of malice, the Ancients smote the entire population, wiping out the people and turning their cities to rubble. Because Orlin betrayed the edicts of the Ancients, he was banished to the world for eternity, damned to walk among the deceased civilization he had unintentionally forged.
Ascension - Carter returns from Velona having blacked out, not realizing an Ancient stowaway responsible for the Velonans' demise has followed her home.