Yuan Dynasty (1271 - 1368)
In 1269, Emperor Yuan Shu Zu made an announcement to use seals with the Mongolian characters for orders of the emperor. The scripts in Mongolian characters were mimicking the writing method of Chinese characters and were called “Ba Si Ba Wen.” These seals were often in larger sizes than the official seals in the Tang and Sung Dynasties.
In
1300, two volumes of “Shuae Gu Pien” were written by Wu Chiu-Yen. This is
the earliest theory ever published for Chinese seal making.