The imperial waka anthology compiled after the Kokin Wakashu as Japan's second Twenty-One Imperial Anthology was the Gosen Wakashu.
The Gosen Wakashu, often shortened to Gosenshu, was commissioned by Emperor Murakami and compiled in 951. It followed the Kokin Wakashu, the first imperial anthology, and helped establish the sequence later known as the Twenty-One Imperial Anthologies.
The collection contains 20 books and 1,426 poems. Its compilers were known as the Five Men of the Pear Chamber: Onakatomi no Yoshinobu, Kiyohara no Motosuke, Minamoto no Shitago, Ki no Tokibumi, and Sakanoue no Mochiki. Unlike the Kokin Wakashu's highly influential structure, the Gosen Wakashu is notable for its interest in private poems and poetic exchanges.
A common mix-up is choosing Shin Kokin Wakashu because it is the best-known later anthology; it was actually the eighth imperial collection. Kin'yo Wakashu came much later, while Man'yoshu predates the imperial anthology tradition and was not the second entry in it.