Answer:
He is the "small child"
Step-by-step explanation:
As the text states, the person in question starts talking after the divinations. He starts by acknowledging the existence of a king that seems to be sick (the king will not suffer harm + the king had improved). So the person is not the king.
Then he states "I, the small child, have obtained a renewed mandate from the three kings. It is the long range that must be considered, and so I await my fate". Therefore, it is possible to inferr that the person talking is the small child.