Brown, pp. 264; prior to Emperor Jomei, the personal names of the emperors were very long, and people did not generally use them. The number of characters in each name decreased after Jomei's reign.
Titsingh, p. 75; Brown, p. 275; Varley, pp. 44, 144; a distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Go-Toba, and Fushimi have achieved senso and sokui in the same year, until the reign of Emperor Go-Murakami.
