Titsingh, p. 139; Varley, p. 183; Brown, p. 264; prior to Emperor Jomei, the personal names of the emperors (their imina) were very long and people did not generally use them. The number of characters in each name diminished after Jomei's reign.
Brown, p. 295; Varley, p. 44; a distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Toba II, and Fushimi have senso and sokui in the same year until the reign of Emperor Go-Murakami.
