been cited as a card game. However it is uncertain if it was actually a card game.

The reference describes Princess Tongchang, daughter of Emperor Yizong of Tang, playing the "leaf game" in 868 with her husband's family. The first known book on the "leaf" game was called the Yezi Gexi and allegedly written by a Tang woman. It received commentary by writers of subsequent dynasties. The Song dynasty (960-1279) scholar