Emperor Kōnin was the 49th emperor of Japan, according to the traditional order of succession. Kōnin's reign lasted from 770 to 781.

Emperor Tenji , known first as Prince Katsuragi and later as Prince Nakano Ōe until his accession, was the 38th emperor of Japan who reigned from 668 to 671. He was the son of Emperor Jomei and Empress Kōgyoku, and his children included Empress Jitō, Empress Genmei, and Emperor Kōbun.