Long ago, people in Japan had many stories. 

Long ago, people in Japan told stories of mononoke. 

In old books, people wrote about these spirits. Some thought a spirit's grudge caused sickness. To help, monks would say special prayers. They would try to move the spirit away. This helped people feel better. Many people believed in these spirits for a long time.
In old Japanese stories, people spoke of mononoke. 

Many people believed these spirits caused many problems. They thought sickness came from a spirit's grudge. This is called a curse. In the Heian period, many nobles feared these spirits. They lived in a very small, closed society. This fear grew even more when many people died from disease. Some thought a person named Sugawara no Michizane caused these deaths.
To help, monks and other people used prayers. They would say special words to stop the spirits. Sometimes they moved the spirit into a person called a yorimashi. This person was often a servant or an apprentice. The goal was to perform an exorcism. This was a way to heal the sick person. Old books like "The Pillow Book" tell us about these ways.
Mononoke are spirits found in Japanese folk religion and classical literature. 
In the past, people had different ways to deal with these spirits. 
History shows us when these ideas first appeared in writing. The term first shows up in Japanese literature in the Nihon Kōki. In the year 830, during the Tenchō 7 period, there was a record about this. It mentioned five monks being invited to recite the Diamond Sutra. In the old language, the word "mono" could mean spirits or oni. The Taihō Code even used the word "ke" to mean diseases. This led to the idea of "mono no ke," or a disease caused by a spirit. This shows how closely people linked spirits to being unwell.
Many famous stories and historical events shaped these beliefs. 
These beliefs grew because of how people lived in the Heian period. The noble families lived in a very closed and small society. This lifestyle helped the fear of mononoke grow in their minds. They also had very delicate personalities and feared the grudges of people they had defeated. As onmyōdō, or a type of way of thinking, spread, these ideas became common. Eventually, people saw almost all sickness and pain as being caused by mononoke. This included the spirits themselves, like the ikiryō and shiryō. 
Mononoke are spirits found in Japanese folk religion and classical literature. 
In the Heian period, people used specific spiritual methods to manage these spirits. Because medical knowledge was not fully developed, illness was often linked to the supernatural. Monks and shugensha would perform incantations and prayers to address these issues. One common method involved a person called a yorimashi. A yorimashi was usually a servant or an apprentice. During an exorcism, practitioners would temporarily move the mononoke into the yorimashi. This process was intended to heal the original person suffering from the spirit. Detailed accounts of these rituals appear in works like The Pillow Book and The Diary of Lady Murasaki.
The history of the term can be traced back to early Japanese records. The first appearance of the word in literature is in the Nihon Kōki. In the year 830, during the Tenchō 7 period, the Nihon Kiryaku recorded a specific event. It stated that five monks were invited to recite the Diamond Sutra to address a matter. In the old language, the word "mono" referred to spirits, oni, or the Ara-mitama. The Taihō Code used the word "ke" to refer to diseases. This led to the phrase "mono no ke," meaning a disease caused by a spirit. 
Different historical figures and events shaped how people viewed these spirits. At first, the connection between spirits and curses was not universally accepted. Emperor Saga once stated that attributing all mononoke to curses was baseless. However, this view changed as onmyōdō, a traditional way of thinking, spread through aristocratic society. The author Harusumi no Yoshitada strongly adopted the concept of mononoke in the Shoku Nihon Kōki. This influence helped cement the idea that vengeful spirits caused societal problems. As onmyōdō became more common, the belief in the power of spirits grew deeper.
Specific historical deaths and epidemics reinforced the fear of vengeful spirits. For example, the deaths of emperors and the spread of epidemics during the Enryaku years were linked to the curse of Prince Sawara. The Nihonkoku Genpō Zen'aku Ryōiki tells of how the grudge of Prince Nagaya led to many deaths. Similarly, the Shoku Nihongi mentions the vengeful spirit of Fujiwara no Hirotsugu. A major turning point occurred after the death of Sugawara no Michizane in 903. Following his death, many members of the imperial and noble families died. People feared these deaths were caused by a curse from Michizane. 
Literature provides famous examples of how these spirits were depicted. In the 9th volume of the Genji Monogatari, titled "Aoi," an ikiryō is a central element. The character Lady Rokujō is depicted as an ikiryō who possesses Aoi no Ue. 
Social and environmental factors also contributed to the rise of these beliefs. During the era of the Fujiwara sekke, noble families lived in a very closed, imperial society. This isolated lifestyle may have fostered a fear of the unknown. Nobles also had delicate personalities and feared the grudges of those they had defeated. Over time, the concept expanded to cover almost all forms of suffering. Epidemic diseases, individual deaths, and physical pain were all seen as mononoke. Eventually, the terms for the spirits themselves, like ikiryō and shiryō, became synonymous with the concept of mononoke.
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