I want to know the answer to the following question:
When did Kublai Khan conquer the song dynasty?
All the background I'm provided with is that "Morris Rossabi, a professor of Asian history at Queens College, City University of New York, writes that "Khubilai wished to be perceived both as the legitimate Khan of Khans of the Mongols and as the Emperor of China.". Is that enough to answer the question?
Answer: no