History

Investiture Controversy: Medieval Conflict over Church Appointments Investiture Controversy Major 11th–12th century dispute between secular rulers and the papacy over who had the right to appoint bishops and abbots; shaped church–state relations and medieval politics.

Ionia: Ancient Greek region on the western coast of Anatolia Ionia Ionia was an ancient Greek coastal region in western Anatolia (modern Turkey), noted for its Ionic dialect, maritime city-states, early philosophers, distinctive art and architectu…

Iran (Islamic Republic of Iran) Iran Iran, historically called Persia, is a country in Western Asia with ancient roots, diverse peoples and languages, a majority Shia Muslim population, major oil resources, and a prom…

Iranian Revolution (1978–1979) Iranian Revolution Mass movement that overthrew the Pahlavi monarchy in Iran and established the Islamic Republic under Ayatollah Khomeini, transforming politics, society, and regional relations.

Irish Civil War (1922–1923): Causes, Course, and Consequences Irish Civil War A concise account of the Irish Civil War (1922–1923), the split over the Anglo‑Irish Treaty, its main phases, key actors, and the political and social legacy in Ireland.

Irish War of Independence (1919–1921) Irish War of Independence Armed campaign by the Irish Republican Army against British rule in Ireland (1919–1921), ending in a truce and the Anglo‑Irish Treaty that created the Irish Free State and partitio…

Iron Age: origins, metallurgy, regional chronologies and cultural impact Iron Age Comprehensive overview of the Iron Age: origins, metallurgical methods, regional timelines, economic and military effects, and key distinctions between meteorite iron, smelting and…

Iron Curtain: political, military and social divide in Europe during the Cold War Iron Curtain The Iron Curtain describes the political, military and ideological boundary separating the Soviet-led Eastern Bloc from Western Europe after World War II and its legacy in memory a…

Islamic Golden Age A period of major intellectual, cultural and economic development across the Islamic world from roughly the 8th to the 13th centuries, noted for advances in science, medicine, arts…

Istrian–Dalmatian exodus: post‑World War II migration of Italian communities Istrian–Dalmatian exodus The Istrian–Dalmatian exodus was the post‑WWII departure of many Italian‑speaking residents from Istria, Fiume (Rijeka) and Dalmatia, driven by border changes, violence, political…

Italian cultural and historical presence in Dalmatia Italian cultural and historic presence in Dalmatia Survey of the Italian influence on Dalmatia: historical phases, architectural and linguistic legacy, cultural institutions, notable towns, 20th-century changes and modern preservat…

Italian irredentism in Dalmatia: history, aims, and legacy Italian irredentism in Dalmatia The movement among some Italian-speaking communities in Dalmatia advocating annexation to Italy from the Napoleonic era through World War II, and its political and cultural consequ…

Italian Libya: colonial rule, development and resistance (1911–1947) Italian Libya Overview of Italian Libya, a North African colony of the Kingdom of Italy from 1911 to 1947: administration, settler policies, resistance, World War II impact, and its legacy in Li…

Italian Plague of 1629–1631 (Great Plague of Milan) Italian Plague of 1629-1631 A major outbreak of bubonic plague that struck northern and central Italy during 1629–1631, causing heavy mortality in Lombardy and other regions and shaping social and economic li…

Italian Renaissance Cultural and intellectual revival that began in 14th‑century Italy, renewing classical learning and transforming art, science, literature and society across Europe.

Italian resistance movement (Resistenza) Italian resistance movement The Italian resistance (la Resistenza) was a diverse partisan movement that fought Nazi Germany and the Italian Social Republic from 1943–1945, shaping Italy's liberation and postw…

Italian unification (Risorgimento) Italian unification The 19th-century political, military and cultural movement that consolidated the Italian peninsula into the Kingdom of Italy (1815–1871), involving diplomacy, wars, uprisings and l…

Iwaki Province (1868) Iwaki Province (磐城国) was a short-lived administrative unit created during the Meiji Restoration (1868–1869) in the area now part of Fukushima Prefecture on Honshū.

Iwase Province (Iwase no Kuni) Iwase Province Iwase Province was a short-lived administrative region of early 8th-century Japan, located in what is now western Fukushima Prefecture on Honshū. It illustrates Nara-period provinc…

Iwashiro Province (Iwashiro-no kuni) — historical Japanese province Iwashiro Province Iwashiro Province was a short-lived administrative province in the area of modern Fukushima Prefecture on Honshū. It was created during the Meiji reorganization (1868) and replaced…

Iyo Province (Iyo-no-kuni) — historical province of Japan Iyo Province Iyo Province (Iyo-no-kuni), also called Yoshū, was a historical province on Shikoku. It largely corresponds to modern Ehime Prefecture and is known for Matsuyama, Imabari, Dōgo Ons…

Jack the Ripper: the unidentified killer of Whitechapel, 1888 Jack the Ripper Overview of the Whitechapel murders attributed to 'Jack the Ripper', the canonical victims, investigative history, social context, suspects and cultural legacy of one of history's…

Jacksonian democracy Early 19th-century American political movement led by Andrew Jackson (from 1828) that broadened white male suffrage, strengthened the presidency, promoted patronage, opposed centra…

Jacobite succession The line of hereditary claimants who, from the deposed Stuart monarchs of 1688, were seen by supporters as the rightful kings and queens of England, Scotland and Ireland and their…

Jagiellon dynasty — Central European royal house from Lithuania Jagiellon dynasty Medieval and early modern royal family originating in Lithuania that ruled Poland, Lithuania, Hungary and Bohemia across the 14th–16th centuries, shaping politics and culture in Ce…

Annexation of Korea by Japan, 1910–1945: treaty, administration and legacy Japanese annexation of Korea Overview of Japan's 1910–1945 annexation of Korea: the 1910 treaty, colonial administration, social and economic policies, wartime end in 1945, and the long-term political and hist…

Japanese calendar Overview of Japan's calendar systems, including the modern Gregorian calendar and the traditional era-name (nengō) system, with history, structure, contemporary uses and notable di…

Japanese era name (nengō/gengō): origin, structure, and modern use Japanese era name The Japanese era name (nengō or gengō) is a traditional system of naming years tied to imperial reigns. It began in the 7th century and remains in formal and cultural use alongside…

Japanese Imperial year (Kōki): calendar based on Emperor Jimmu's founding Japanese Imperial year Kōki (皇紀) is a Japanese year-counting system that begins with the legendary founding by Emperor Jimmu in 660 BC. It was used for national symbolism and official dating before and d…

Japanese occupation of Hong Kong (1941–1945) Japanese occupation of Hong Kong Period when Imperial Japan administered Hong Kong after the 1941 surrender; involved military rule, civilian hardship, internment of Allied civilians, resistance and postwar trials…

Japanese occupation of Singapore (1942–1945) Japanese occupation of Singapore The Japanese occupation of Singapore (1942–1945) was a pivotal World War II episode marked by military defeat, harsh civilian rule, economic collapse, and long-term effects on Sing…

Jasenovac concentration camp: history, structure, victims, and legacy Jasenovac concentration camp An overview of the Jasenovac camp complex in the Independent State of Croatia during World War II: organization, victim groups, historical context, contested victim counts, afterma…

Jayhawker: Origins, history and modern legacy Jayhawker Jayhawker originally named militant Free-State guerrillas in Bleeding Kansas; later it became a Kansan identity and the basis for the University of Kansas 'Jayhawk' mascot and rela…

Jewish diaspora: history, communities, and modern distribution Jewish diaspora Overview of the Jewish diaspora: origins, major dispersals, distinct communities (Ashkenazi, Sephardi, Mizrahi), cultural life, modern migrations, and ongoing global significance.

Jewish–Roman wars: revolts in Roman Judea and their aftermath Jewish–Roman wars Series of major Jewish uprisings against Roman rule in and beyond the province of Judea (1st–2nd centuries CE), including the Great Revolt, the Kitos War and the Bar Kokhba revolt,…

Jhalawan — historical region of Balochistan Jhalawan Jhalawan was a historical region and princely territory in what is now southern Balochistan, established in the 17th century and later bound with Sindh by an 1853 frontier settleme…

Jian (治安) — a Japanese era of the early 11th century Jian (era) Jian (治安, pronounced Chi'an or Jian) was a Japanese era from February 1021 to July 1024 during the Heian period, under Emperor Go-Ichijō; it followed Kannin and preceded Manju.

Jin dynasty (1115–1234) Jurchen-led dynasty that ruled northern China from 1115 to 1234, founded by the Wanyan clan; notable for conquering northern Song territory, sinicization, and eventual defeat by th…

Jingo-keiun — Japanese era (767–770) during Empress Shōtoku's reign Jingo-keiun Jingo-keiun was a Japanese era name (nengō) that lasted from August 767 to October 770 in the Nara period, coinciding with the reign of Empress Shōtoku (formerly Empress Kōken).

Jinki (era): Japanese era name from 724 to 729 Jinki (era) Jinki was a Japanese era name (nengō) from February 724 to August 729 during the early reign of Emperor Shōmu; its name is usually rendered “Sacred tortoise.”

Jiryaku: Japanese era name (1065–1069) Jiryaku Jiryaku (治暦) was a Japanese era name from August 1065 to April 1069, spanning the late Heian period during the reigns of Emperors Go-Reizei and Go-Sanjō.

Jishō era (1177–1181) — late Heian period in Japan Jishō Jishō (治承) was a Japanese era from August 1177 to July 1181 during the late Heian period, spanning the reigns of Emperor Takakura and Emperor Antoku and encompassing the opening ye…

Jōan era (1171–1175) Jōan (era) Japanese era name Jōan (承安), spanning April 1171 to July 1175 during Emperor Takakura's reign; part of the late Heian period and the political era before the Genpei War.

Jōei (Japanese era, April 1232–April 1233) Jōei Jōei (貞永) was a Japanese era name lasting from April 1232 to April 1233, spanning the end of Emperor Go-Horikawa's reign and the accession of Emperor Shijō during the Kamakura peri…

Jōgan era (859–877) — Japanese nengō of early Heian period Jōgan Jōgan (859–877) was a Japanese era name in the early Heian period during the reigns of Emperors Seiwa and Yōzei. It is noted for political consolidation under Fujiwara regents and…

Jōgen (Japanese era name) Jōgen Jōgen refers to two separate Japanese era names (nengō): Heian-period Jōgen (976–978, 貞元) and Kamakura-period Jōgen (1207–1211, 承元). Overview, context, differences and historical u…

Jōgen (Heian period): Japanese era 976–978 Jōgen (Heian period) Jōgen (貞元) was a Japanese era name (nengō) from July 976 to November 978 during Emperor En'yū’s reign. This article explains its place in the nengō system, context, and historical…

Jōgen (承元): a Japanese era of the early Kamakura period (1207–1211) Jōgen (Kamakura period) Jōgen (承元) was a Japanese era name from October 1207 to March 1211 during the early Kamakura period, spanning the reigns of Emperors Tsuchimikado and Juntoku and set against the ri…