Final answer:
Kublai Khan is the first to claim the mandate of heaven and declare himself the emperor of the Yuan dynasty.
Step-by-step explanation:
Kublai Khan is the first to claim the mandate of heaven and declare himself the emperor of the Yuan dynasty. After defeating the Song dynasty, Kublai Khan declared that the mandate of heaven had shifted to him, solidifying his political legitimacy in China. He became the first ruler over all of China who was not of Chinese origin.
Kublai Khan proclaimed the Yuan dynasty, establishing his rule over all of China and asserting his authority under the concept of the Mandate of Heaven.