 Practical printing can be dated to the 11th century, during the Heian era when Chinese texts from the Song dynasty became popular in Japan in the form of commentaries on sutras and doctrines.Nara became the center of non-devotional printing in Heian Japan and the oldest existing example of this kind is the Joyuishikiron (a Buddhist text in Chinese) of 1088 printed by the monks of the Kōfuku-ji temple.Kyoto became the center of devotional printing because this is where the aristocratic sponsorship for such printing existed.