In 1170, Goshirakawa met a person from Song at the Fukuhara mountain retreat, but this was an act that was considered taboo because of Emperor Uda's will and Kanezane KUJO wrote with astonishment, 'This is the most shocking event in Japan since Engi era.
嘉応2年（1170年）後白河は福原山荘にて宋人と対面しているが、これは宇多天皇の遺戒でタブーとされた行為であり、九条兼実は「我が朝、延喜以来未曾有の事なり。