Brown, pp. 264; prior to Emperor Jomei, the personal names of the emperors were very long and people did not generally use them; however, the number of characters in each name diminished after Jomei's reign.
Titsingh, p. 112; Brown, p. 284; Varley, p. 44; a distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Go-Toba, and Fushimi have senso and sokui in the same year until the reign of Emperor Go-Murakami.
