The four oldest examples of kashu: Hitomarushu (the Collected Works of KAKINOMOTO no Hitomaru), Akahitoshu (the Collected Works of YAMABE no Akahito), Yakamochishu (the Collected Works of OTOMO no Yakamochi), and Sarumarushu (the Collected Works of Sarumaru Dayu) were compiled around the early tenth century.
家集のもっとも古い例は10世紀前半ごろに編纂されたと思われる人丸集・赤人集・家持集・猿丸集の四種である。