The oldest kyozuka that is known today is believed to be the one on the top of Mt. Kinpo in Yamato Province, in which a bronze sutra case with ganmon (prayer) inscribed on the outside by FUJIWARA no Michinaga that contained Konshi-kinji-kyo (sutras in gold on dark-blue paper) was buried.
現在知られる経塚の最古は、藤原道長が外面に願文を書き、なかに紺紙金字経を収めた銅製の経筒を大和国の金峰山山頂に埋納した例とされている。