The Knights of the Round Table were the retainers of King Arthur. When Merlin descended himself, he entrusted his secrets to Arthur and the Knights. They also searched for the Sangraal, after Morgan Le Fay stole it. Legend says they traveled to three distant lands: Castiana, Sahal, and Vagonbrei. However, it appears that they weren't just searching for the Sangraal, but Merlin as well. When SG-1 found Merlin, he compared Dr. Daniel Jackson to Galahad, Lt. Colonel Cameron Mitchell to Perceval, Lt. Colonel Samantha Carter to Guinevere and Ba'al to Mordred. While Merlin was confused at the time, when Daniel had his memories, he commented that Mitchell really did look like Perceval however. (SG1: "Avalon, Part 1", "Camelot", "Morpheus", "The Pegasus Project", "The Quest, Part 2")