It is recorded how in 755, four people were appointed as sanshi in both Sakyo and Ukyo (the areas to the right and left of Heijokyo (the ancient capital), as well as in the Kawachi, Settsu and Yamashiro provinces; this was done to ensure the smooth implementation of the Handen Shujo law (a law for periodically reallocation rice land).
天平勝宝5年（755年）には班田収授法の円滑な実施のため、平城京の左右両京・河内国・摂津国・山城国にそれぞれ4名ずつの算師が任命されたことが記録されている。