The Tales of Ise
The "Kokinshū", "Tales of Ise" and "Tales of Yamato" all describe Narihira leaving Kyoto to travel east through the Tōkaidō region and crossing the Sumida River, composing poems at famous places (see "utamakura") along the way. "The Tales of Ise" implies this journey was the result of the scandalous affair between Narihira and Fujiwara no Takaiko. There are doubts as to whether this journey actually took place, from the point of view both that the number of surviving poems is quite small for having made such a trip and composing poems along the way, and in terms of the historical likelihood that a courtier could have gone wandering to the other end of the country with only one or two friends keeping him company.