Konjaku Monogatarishū (今昔物語集, lit. Anthology of Tales from the Past), also known as the Konjaku Monogatari (今昔物語) is a Japanese collection of over one thousand tales written during the late Heian period (794-1185). The entire collection was originally contained in 31 volumes, of which only 28 remain today. The volumes cover various tales from India, China and Japan.
Each tale in the Konjaku Monogatarishū starts with the phrase once upon a time (今は昔) (lit. now long ago), which in its Japanese reading is pronounced ima wa mukashi. The Chinese-style pronunciation of this phrase is konjaku, and it is from the Chinese-style reading that the collection is named. The Konjaku Monogatarishū is commonly known by the shorter name "Konjaku Monogatari". Since it is an anthology rather than a single tale, however, the longer title is more accurate.
The Konjaku Monogatarishū is divided according to the region of the text. The first five volumes, the 天竺 (Tenjiku) section, contain tales set in India. The next five volumes, the 震旦 (Shintan) section, contain tales set in China. The remainder of the anthology, the 本朝 (Honchō) section, contains tales from Japan.
It is important to note that the arrangement of the stories is in parallel to how Buddhism travelled to Japan. The collection emphasizes the path in which Buddhism takes to Japan in order to further understand what Buddhism means to Japan. Firstly, Buddhism leaves India and becomes very popular in China. As many things have been borrowed from the Chinese, Buddhism then travels to Japan. Each move leads to a morphing of the basics of this religion so by that time it arrived in Japan, it became a new Buddhism for the Japanese.
The subject-matter is largely drawn from Buddhist and secular folklore. The anthology contains no mythology, and references to Shinto-related themes are notably few. The Buddhist tales cover a wide range of topics, both historical tales about the development, transmission, and spread of Buddhism, and dogmatic tales which emphasize karmic retribution. The folkloric tales mostly depict encounters between human beings and the supernatural. The typical characters are drawn from Japanese society of the time — nobility, warriors, monks, scholars, doctors, peasant farmers, fishermen, merchants, prostitutes, bandits, beggars. Their supernatural counterparts are oni and tengu.
The work is anonymous. Several theories of authorship have been put forward: one argues that the compiler was Minamoto no Takakuni, author of Uji Dainagon Monogatari, another suggests the Buddhist monk Tobane Sōjō, a third proposes a Buddhist monk living somewhere in the vicinity of Kyoto or Nara during the late Heian period. So far no substantive evidence has emerged to decide the question, and no general consensus has formed.
The date of the work is also uncertain. From the events depicted in some of the tales it seems likely that it was written down at some point during the early half of the 12th century, after the year 1120.
The oldest extant copy of the Konjaku Monogatarishū is the Suzuka Manuscript (鈴鹿家旧蔵本). Designated as a National Treasure in 1996, it was assembled by a Shinto priest named Tsuretane Suzuka in the Kamakura period (1185 – 1333). The manuscript was then brought to Kyoto University by a descendant who was a librarian at the university for donation and archiving. The manuscript has been scanned and made available in digital format on the internet.
In this work, specific human traits and characteristics such as the ability to think, feel, and speak in a human method of cognition are assigned to various types of animals. By assigning human traits to the animals, and through the utilization of these anthropomorphic animals, the authorship was more effectively able to communicate the various motifs, which impart a variety of moral teachings. To be able to implement such a paradigm, the authorship would have utilized pre-conceived common traits which were attributable to specific animals. The animals and their respective traits would have been common and implicit knowledge in ancient Japan, and therefore known ubiquitously. The types of tales in Konjaku which include the use of anthropomorphic animals can be broadly classified into categories, in which a particular moral is accentuated.
Many of the tales which appear in the Konjaku are also found in other collections, such as ghost story collections; having passed into the common consciousness, they have been retold many times over the succeeding centuries. Modern writers too have adapted tales from the Konjaku Monogatarishū: a famous example is Akutagawa Ryūnosuke's In a Grove (well known in the West from Kurosawa's film Rashomon). Other authors who have written stories based on tales from the Konjaku include Jun'ichirō Tanizaki and Hori Tatsuo.
The setsuwa in Konjaku Monogatari Shū has two main purposes: religious and secular. The religious aspect is important in leading the reader into a deeper understanding of Buddhism and what it means to the Japanese people.  These stories try to appeal to commoners and to the masses by presenting Buddhism is a simple yet meaningful way. It presents Buddhism in a way that is understandable for people from any background. Rewards for faith will be immediate and the punishment of sin is also direct and immediate. The secular aspect is for entertaining an audience as well as for the enjoyment of reading.
A cryptic line in Akutagawa's classic short story Rashōmon says「旧記の記者の語を借りれば、『頭身の毛も太る』ように感じたのである。」(lit. To borrow a phrase from the writers of the chronicles of old, he felt as if 'even the hairs on his head and body had grown thick'.) This is a reference to a line from the Konjaku Monogatarishū; figuratively the phrase means He was scared, he felt as if his hair was standing on end.
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