The Scholar

The Scholar by Morena
Gen Merlin & Arthur

http://www.tthfanfic.org/wholestory.php?no=28215#chapter1

Very good story of Merlin while waiting for Arthur to be reborn gets involved in the Stargate Program as an old man. It just goes hilariously downhill from there. The story explores some of what happens although the timeline in SG1 is not really changed just added to. Then Merlin realizes that Arthur is ready to be born so before he leaves SGC He brings in a long mysterious package that when he unwraps it in the gateroom turns out to be a sword that he thrusts into the ground that rises around it until it becomes the Sword in the stone. Good writing, and as for the ending it was perfect especially the story of the dragon that lasts through generations. Not to take away from or make light of the author but this is the kind of refreshing story you need when you finish an intense, dark, or angsty story to help you recharge