After getting a tablet detailing an Ancient treasure trove on Earth, Vala Mal Doran brought the tablet to Dr. Daniel Jackson who translated it, learning that it had been written by the Ancient Merlin. SG-1 was able to track the treasure to Avalon, but when Daniel and Vala used an Ancient long-range communication device, they exposed the existence of human life in the Milky Way to the Ori, Ascended beings that were the Ancients' oldest enemy. Determined to gain more power for themselves and destroy the Ancients once and for all, the Ori started a crusade to convert the Milky Way galaxy to worshipping them, led by the Orici Adria. (SG1: "Avalon, Part 1", "Avalon, Part 2", "Origin", "Camelot", "Flesh and Blood")