740s in Japan

was a after Jinki and before Tenpyō-kanpō. This period spanned the years from August 729 through April 749. The reigning emperor was .

was a after Tenpyō and before Tenpyō-shōhō. This period spanned mere months, April through July 749. The reigning emperor was .

was a after Tenpyō-kanpō and before Tenpyō-hōji. This period spanned the years from July 749 through August 757. The reigning empress was .

war in Japan