Osric

Osric was the village librarian who was guarding the archives. When Adria needed to find the Sangraal before the Tau'ri she probably killed Osric and took in his place. Some time passed and the villigers didn't know that it was not Osric but Adria. Osric now Adria led SG-1 and later Ba'al as well to the Sangraal. Daniel Jackson discoverd that Osric was not himself anymore when they had to give an object to get out of the trap. When they would enter the caves it was discoverd that Osric was Adria.