Generally, the first introduction of Neo-Confucianism into Japan was said to have occurred through Shunjo, a monk of the Shingon sect who entered Sung in 1199, and brought back Neo-Confucianism to Japan, however, it is not certain, since there are many different opinions.
一般には正治元年（1199年）に入宋した真言宗の僧俊じょうが日本へ持ち帰ったのが日本伝来の最初とされるが、異説も多く明確ではない。