There is a third sword-wielding knight, right next to the corpse with the skeptic's spice in the with theDrakkeeer en route to the egg. If the sword only drops from those bearing swords (as is standard), this is another option.
The four on the right side of the stairway to the dragon also wield swords,ng a totaki ma of 6 in the zone. I got my sword from one of these. Took a total of 28 sword-wielding knights.