▁in ▁the ▁Six ▁National ▁Histor ies ▁series . ▁It ▁covers ▁the ▁years ▁ 8 5 0 - 8 5 8 , ▁the ▁years ▁of ▁reign ▁of ▁the ▁ 5 5 th ▁Japanese ▁so ver eign , ▁Emperor ▁Mon to ku ▁( 8 2 7 - 8 5 8 ). ▁ ▁Background ▁ ▁Following ▁the ▁earlier ▁national ▁history ▁Sh oku ▁N ih on ▁K ō ki ▁( 8 6 9 ), ▁in ▁ 8 7 1 ▁Emperor ▁Se i wa ▁ordered ▁the ▁compilation ▁of ▁the ▁years ▁since ▁then . ▁It ▁was ▁primarily ▁edited ▁by ▁Fu ji w ara ▁no ▁Mot ots une ▁with ▁assistance ▁from ▁Min ab uch i ▁no ▁T osh ina , ▁ Ō e ▁O ton do , ▁Sh im ada ▁no ▁T ada omi , ▁Sug aw ara ▁no ▁Kore y oshi , ▁Y os hib uch i ▁no ▁Y osh in ari , ▁and ▁significant ▁contributions ▁by ▁Mi y ako ▁no ▁Y osh ika . ▁The ▁text ▁was ▁completed ▁in ▁ 8 7 9 . ▁ ▁Cont ents ▁ ▁Writ ten ▁in ▁Kan b un - style ▁and ▁contained ▁within ▁ten ▁volumes , ▁the ▁contents ▁cover ▁nine ▁years ▁of ▁Emperor ▁Mon to ku ' s ▁reign ▁sp anning ▁from ▁ 8 5 0 ▁through ▁ 8 5 8 . ▁The ▁text ▁is ▁characteristic ▁in ▁that ▁it ▁contains ▁few ▁political ▁details ▁but ▁many ▁ob itu aries ▁for ▁nobles . ▁ ▁See ▁also ▁▁ ▁Ru ij ū ▁K ok ush i , ▁a ▁categor ized ▁and ▁chron ological ▁history ▁text ▁of