The tumuli in this group include huge keyhole-shaped ones constructed on the south slope of the Saki hill in the period from the latter half of the first half to the middle era of the kofun (tumulus) period, or in the era from towards the end of the fourth century to the first half of the fifth century.
本古墳群は、佐紀丘陵の南斜面に前期後半から中期、つまり4世紀末から5世紀前半にかけて巨大前方後円墳が営まれた。