The third line - now we are on the back half on the crown - is the twin brothers: Saint Cosmas and Saint Damain, physicians, martyrs. They healed with pure altruism. I don't think they have from that perceivable duality we can observe at the previous saints.

So for me the pictorial message of the lower part of the Crown is about the role of the king. He is a ruler, a judge, but the servant of God who is the only suzerain above him. He is responsible to spread Christianity by Arms and by Word, both as a leader of masses and as champion in person. He also has to care for his subject's well being, curing their physical and spiritual illnesses (maybe this role has something to do with the "royal touch", laying on hands).