The Tales of Ise
In the early Heian period (at the beginning of the 10th century), chōka was seldom written and tanka became the main form of waka. Since then, the generic term "waka" came to be almost synonymous with tanka. Famous examples of such works are the diaries of Ki no Tsurayuki and Izumi Shikibu, as well as such collections of poem tales as "The Tales of Ise" and "The Tales of Yamato".