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    Epidemic, fire, harvest failure, eruption and pollution affected households through lost labor, homes, food and usable land. The responses in this selection range from tax relief and rebuilding to neighborhood brigades, medical care and petitions against industrial damage. Neither disaster nor assistance reached everyone in the same way. The guides identify concrete pressures and the institutions asked to respond, while keeping uncertain death totals and broad claims of causation qualified. The linked articles allow closer comparison of official measures with residents’ experiences. Together these episodes open a history of everyday vulnerability and collective action without reducing it to a sequence of natural calamities.

    1. 01 · 737

      The Tenpyō Epidemic and the Deaths of the Four Fujiwara Brothers

      • Historical contextDisease spread from Kyushu amid drought and threatened harvests. Court records show disrupted attendance and requests for assistance rather than a complete account of transmission.
      • Key playersShōmu’s government ordered aid and religious responses. Four influential Fujiwara brothers died, while surviving households faced labor loss, taxes and outstanding grain debts.
      • What happenedThe 737 epidemic interrupted government and brought extensive deaths. Tax remission and specified debt cancellation accompanied medicine, prayer and scripture recitation.
      • Why it matteredMinisterial appointments changed after the Fujiwara losses, while material and religious relief responded to wider hardship. Later Buddhist projects also had other political and economic causes.
      • What to noticeKeep modern identification as smallpox qualified. The surviving records establish severe disruption without supporting one exact national mortality rate.
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    2. 02 · 995

      The 995 Epidemic and Michinaga’s Rise at Court

      • Historical contextAn epidemic coincided with the deaths of successive Fujiwara leaders. Open offices created opportunities, but surviving relatives still had to secure imperial decisions.
      • Key playersMichinaga competed with his nephew Korechika. His sister Senshi, Emperor Ichijō’s mother, supported him; Korechika retained ties through Empress Teishi.
      • What happenedIn 995 Michinaga gained the right to review documents before the throne and became minister of the right. The contest continued into punishments and appointments in 996.
      • Why it matteredControl of document access made influence operational before a regency. Epidemic deaths changed the field without themselves deciding the political outcome.
      • What to noticeFollow appointments, household connections and procedures. Disease created vacancies; the emperor and courtiers determined who could use them.
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    3. 03 · 1360-1361

      Epidemic and Harvest Loss amid the Civil War of 1360–1361

      • Historical contextCivil war continued as records reported epidemic disease and abnormal weather in 1360–1361. Estates faced the combined pressure of harvest loss, dues and military extraction.
      • Key playersTara estate’s cultivators petitioned Tōji about damaged barley. Inspectors and estate officials assessed claims, while armed followers collected provisions in the same locality.
      • What happenedReports of disease and cold coincided with documented requests for inspection and continuing military demands. The named cases reveal overlapping pressures rather than one nationwide statistical picture.
      • Why it matteredAdministrative disputes show how livelihood crises became questions about what could be collected. Armed claims could persist despite damage to production.
      • What to noticeSeparate a chronicler’s dramatic scale from measurable local evidence. Neither the pathogen nor a single climatic cause of every loss is securely established.
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    4. 04 · 1657

      The Great Fire of Meireki and Edo’s Reconstruction

      • Historical contextDry conditions and strong winds exposed Edo’s wooden districts to spreading fire. Existing equipment relied heavily on demolition and offered limited protection.
      • Key playersResidents fled while shogunal officials organized relief and rebuilding. Townspeople, warriors and religious communities all lost property and faced relocation.
      • What happenedThree major fires devastated Edo in 1657. The government distributed aid, moved some institutions, widened routes and created open spaces to interrupt future fires.
      • Why it matteredReconstruction altered the city’s geography and expanded particular safeguards. The castle keep was not rebuilt, and improved arrangements did not end recurring urban fires.
      • What to noticeCompare reconstruction policy with accounts of flight and memorial rites. Exact death totals remain uncertain, while narrative sources preserve experiences beyond official building losses.
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    5. 05 · 1718-1722

      Ōoka Organizes Edo’s Town Fire Brigades

      • Historical contextEdo’s combustible town districts needed protection alongside the warrior services guarding castles and residences. Neighborhood responsibility offered another means of organizing labor and expenses.
      • Key playersTown magistrate Ōoka Tadasuke acted under Yoshimune. Headmen organized companies, and construction workers supplied skills in climbing and dismantling buildings.
      • What happenedBeginning in 1718, town brigades were established and then reorganized. Districts and companies developed over successive arrangements rather than one completed scheme on the first day.
      • Why it matteredLocal funding and building expertise supported a recurring public service. Firefighters confronted flames and falling structures while protecting the urban communities financing them.
      • What to noticeLook at demolition as the principal technique, rather than imagining modern firefighting equipment. Familiar company counts describe later organization, not necessarily the initial order.
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    6. 06 · 1722

      Koishikawa Yōjōsho Opens for Poor Patients

      • Historical contextPeople unable to afford treatment had few dependable options. Yoshimune’s suggestion box offered a route for proposing assistance to the shogunate.
      • Key playersPhysician Ogawa Shōsen proposed the facility; shogunal officials authorized it. Doctors and town headmen helped build confidence in its care.
      • What happenedKoishikawa Yōjōsho opened in 1722 inside the medicinal garden. Initial suspicion discouraged patients, but inspection and relaxed conditions increased demand beyond its first capacity.
      • Why it matteredThe institution supplied treatment to eligible poor patients, while later medical publications addressed readers elsewhere. Capacity and admission requirements limited its reach.
      • What to noticeFollow how trust and access changed after opening. Establishing a hospital was only the first step toward people actually using it.
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    7. 07 · 1782-1788

      The Tenmei Famine

      • Historical contextRepeated poor harvests developed into a prolonged famine. Eruption damage, restricted grain movement and uneven reserves added to existing shortages.
      • Key playersAffected households faced hunger and migration. Domain authorities arranged varying relief; Matsudaira Sadanobu organized a particular supply response using grain and transit from other territories.
      • What happenedThe crisis intensified during the 1780s, especially in eastern and northeastern Japan. Relief efforts coexisted with rising prices and attacks on urban rice dealers.
      • Why it matteredFood security depended on transport, purchasing power and administrative decisions as well as crops. Later reforms emphasized storage and rural recovery.
      • What to noticeCompare regions and relief arrangements. Asama’s eruption did not initiate every shortage, and population decline includes migration as well as deaths.
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    8. 08 · 1783

      Asama’s Tenmei Eruption

      • Historical contextAsama’s renewed activity culminated during a famine already in progress. Settlements below the volcano were exposed both to falling material and to river-borne debris.
      • Key playersKanbara’s residents suffered overwhelming loss; communities along the Agatsuma and Tone rivers faced downstream damage. Survivors reconstructed households and cultivated land.
      • What happenedThe 1783 eruption buried settlements and sent destructive sediment into river systems. Recovery extended over decades, alongside memorial rites and religious observance.
      • Why it matteredThe disaster linked mountain processes to distant livelihoods and routes. It aggravated famine pressures without explaining every harvest failure across Japan.
      • What to noticeTrack the destruction downstream as well as at the volcano. Excavated remains establish burial conditions, but cannot prove the family relationships imagined in later retellings.
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    9. 09 · 1841–1843

      The Tenpō Reforms

      • Historical contextFamine, fiscal strain and unrest led the shogunate to seek stricter economy and regulation. Officials associated high prices and urban display with weakened order.
      • Key playersSenior councillor Mizuno Tadakuni directed the reforms. Merchants, urban residents and domain lords faced measures affecting livelihoods, commerce and landholding.
      • What happenedFrom 1841 the government dissolved licensed associations, restricted consumption and proposed taking territory around Edo and Osaka. Opposition and poor results forced retreat by 1843.
      • Why it matteredThe program demonstrated broad intervention but exposed limits to commanding markets and powerful landholders. Its failure left unresolved pressures before the treaty-port crisis.
      • What to noticeCompare the government’s diagnoses with the operation of its measures. A plan to control territory or prices could provoke resistance without producing the intended result.
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    10. 10 · 1880–1913

      The Ashio Copper-Mine Pollution Crisis

      • Historical contextRapid expansion at Ashio carried mining waste into the Watarase basin and damaged vegetation through smelting smoke. Floods spread contaminated material across farms and fishing grounds.
      • Key playersAffected residents organized petitions and evidence. Tanaka Shōzō raised their claims in the Diet, while mining authorities and government commissions pursued responses.
      • What happenedProtests and investigations brought prevention orders, but pollution and flooding continued. River-control plans led to Yanaka’s abolition and forced demolition of remaining homes.
      • Why it matteredIndustrial output imposed costs across a river basin, and remedies could inflict further loss. Residents’ collective action continued beyond Tanaka’s parliamentary career.
      • What to noticeDistinguish pollution prevention from an end to harm. The account’s closing date of 1913 marks Tanaka’s death, not the resolution of the crisis.
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