Medieval Christian planet
The first off-world settlement depicting Christianity that Stargate Command has encountered in their galactic travels. The village was governed by a Canon who maintained order with a weather control ring.
For a considerable period of time the settlement was plagued by regular visits from a demon (Unas) doing the bidding of his mater, the devil (Sokar). He would regularly take five souls from the village -- usually to be selected by the Canon -- back to Sokar to be enslaved in the fires of hell (Ne'tu).
SG-1's arrival changed this. The Canon was stripped of his power, and the Unas who plagued the village was destroyed.
Demons - SG-1 comes upon the Medieval Christian planet, the first evidence of Christianity in the rest of the galaxy.