The MongolKhagan, Kublai Khan, releases 75 Song Dynasty Chinese merchants from captivity after they had been captured along the border of the Mongol Empire and the Chinese Southern Song Dynasty. This is an act to increase his reputation amongst the Chinese, shore up his legitimacy as a just ruler, and to gain more defectors from the Southern Song Dynasty.
The earliest extant Chinese illustration of 'Pascal's Triangle' is from Yang Hui's book Xiangjie Jiuzhang Suanfa, published in this year, although knowledge of Pascal's Triangle existed in China by at least 1100.