Vagonbrei (also known as Verus Gen Bree (land of royal truth) in Ancient) is a planet that King Arthur and the Knights of the Round Table traveled to in search of the Sangraal. Shortly after the Knights left, the inhabitants began to suffer from a sickness that eventually wiped them out, though the people believed that they had been cursed by Morgan Le Fay. SG-1 traveled to the planet while searching for the Sangraal, where they found clues pointing them to Atlantis. (SG1: "Camelot", "Morpheus")
Behind the scenes
Stargate SG-1: The DVD Collection issue 77 gives an entirely different address for this planet () but this is contradicted by on-screen evidence, which gives the address we currently use in this article.