History

Old Japanese: the language of early Nara and its written record Old Japanese Old Japanese refers to the earliest attested stage of Japanese, preserved in 7th–8th century texts. It is known from Chinese-derived writing, man'yōgana, wooden tablets and poetic…

Old Kingdom of Egypt: Age of the Pyramids and Early Centralized State Old Kingdom of Egypt The Old Kingdom (c. 27th–22nd centuries BCE) was the formative high point of ancient Egypt, noted for centralized royal power, monumental pyramid building, distinctive art, and adm…

Old Persian: Early Southwestern Iranian Language and Achaemenid Inscriptions Old Persian language Old Persian, the earliest recorded southwestern Iranian tongue found in Achaemenid royal inscriptions (6th–4th c. BCE), its cuneiform script, distribution, and legacy in Iranian la…

Old Style and New Style dates: Julian vs Gregorian and the change of the new year Old Style and New Style dates Explanation of Old Style (O.S.) and New Style (N.S.) dates: calendar systems, why Britain and others switched, double dating, examples and how historians record dates across calend…

Oldest people (verified longevity records) Oldest people Overview of verified oldest people: definitions, how claims are validated, notable records, demographic patterns, and why these cases matter to research and public interest.

Olei Hagardom: Jewish Underground Members Executed During the British Mandate Olei Hagardom Olei Hagardom refers to twelve Jewish militants from Irgun and Lehi who were hanged by British authorities during the Mandate period; they remain a contested symbol in Israeli memo…

Omi (Ōmi): Ancient Japanese Hereditary Title and Political Rank Omi Omi (Ōmi) was a hereditary kabane title in early Japan, used by the most powerful Yamato clans to denote high social and political standing and often linked to senior ministerial r…

Ōnin era (1467–1469) Ōnin A short Japanese era (nengō) from March 1467 to April 1469 during Emperor Go-Tsuchimikado’s reign, notable for the outbreak of the Ōnin War and the political collapse that led to t…

Ōnin War (1467–1477) Ōnin War A decade-long civil war in Japan (1467–1477) that began as a succession and factional dispute, devastated Kyoto, undermined central authority and ushered in the Sengoku (Warring St…

Opium Wars: Conflicts that opened China to the West Opium Wars Two mid-19th century conflicts between Qing China and Western powers over opium trade, diplomacy and trade rights that reshaped China’s sovereignty, commerce, and modern history.

Oral history: recording and preserving spoken memories Oral history Oral history records people's spoken memories and testimony to preserve personal, social, and community pasts. It complements written records and uses interviews, recordings, and c…

Oregrounds iron — Swedish bar iron prized for steelmaking Oregrounds iron Oregrounds iron is a high-quality Swedish bar iron produced from charcoal-fired furnaces and finery forges in the 18th–19th centuries, widely exported for conversion into steel and…

Oriental studies: scope, history, and contemporary perspectives Oriental studies Survey of Oriental studies (area studies of Asia), its scope, historical roots in European scholarship, major subfields, modern uses, and debates about terminology and methods.

Orontid dynasty (Eruandid / Yervanduni): rulers of ancient Armenia Orontid dynasty Armenian ruling house of Achaemenid and Hellenistic eras, known as the Orontids (Eruandid/Yervanduni), who governed the satrapy and later an independent kingdom before the rise of…

Ostrogoths: Origins, Kingdoms, and Legacy Ostrogoths A concise encyclopedia entry on the Ostrogoths: their origins, society, migration from the Baltic, kingdom in Italy under Theodoric, and historical legacy.

Ot en Sien: Dutch children's stories, education and cultural legacy Ot en Sien Ot en Sien are fictional Dutch children from early 20th-century storybooks used in schools. The tales, illustrations and educational aims shaped Dutch childhood and remain a cultur…

Ōtoku: Japanese era (1084–1087) under Emperor Shirakawa Ōtoku Ōtoku (応徳) was a Japanese era name from February 1084 to April 1087 during the Heian period, coinciding with the later reign of Emperor Shirakawa and preceding his abdication and c…

Ottoman Empire: history, structure, and legacy Ottoman Empire A concise encyclopedia entry on the Ottoman Empire — its origins, institutions, expansion, decline and cultural legacy, with pointers to related names and topics.

Ottoman Turkish (Lisân-ı Osmânî): language of Ottoman administration and literature Ottoman Turkish Ottoman Turkish was the formal Turkish of the Ottoman state (13th–early 20th c.), written in a Perso‑Arabic script and heavily influenced by Arabic and Persian in vocabulary and li…

Ottonian dynasty (Liudolfing/Saxon rulers of early medieval Germany) Ottonian dynasty Medieval royal house of Saxon origin that united German duchies and shaped the early Holy Roman Empire under Otto I and his successors (10th–11th centuries).

Ōwa (Japanese era, 961–964) Ōwa Ōwa (応和) was a Japanese era name (nengō) from February 961 until July 964 during Emperor Murakami's reign; it succeeded Tentoku and preceded Kōhō and is used to date Heian-period d…

Pachacuti — Inca ruler who remade Cuzco into the Tawantinsuyu Pachacuti Pachacuti (Pachakutiq) was the ninth Sapa Inca credited with transforming Cuzco into the Inca Empire (Tawantinsuyu), instituting administrative reforms, promoting monumental buildi…

Pahlavi dynasty The last Iranian royal house (1925–1979), founded by Reza Shah Pahlavi; notable for centralizing the state, rapid modernization, secular reforms, close Western ties, and its fall i…

Pakistan Declaration (Now or Never): origin and impact of the 1933 pamphlet Pakistan Declaration Account of the 1933 pamphlet 'Now or Never' by Choudhary Rahmat Ali, which first used the name Pakistan, describing its content, origins, reception and legacy leading to the Pakist…

Pala Empire: Buddhist rulers of Bengal and Bihar (8th–12th centuries) Pala Empire Medieval Indian dynasty centered in Bengal and Bihar (8th–12th c.), noted for Buddhist learning, monasteries such as Nalanda and Vikramashila, distinctive art, and links with Tibet…

Paladin: historical office, medieval champion, and modern cultural figure Paladin Paladin: originally a Roman palace official, later a high medieval noble or papal officer, famed in chansons de geste as Charlemagne’s champions and today a symbol in chivalric ide…

Paleography: the study of historical handwriting and scripts Paleography Paleography is the discipline that analyzes historical handwriting to read, date, and contextualize manuscripts, inscriptions, and documents across cultures and periods.

Pallava dynasty South Indian dynasty centered at Kanchipuram (c. 3rd–9th centuries CE), notable for pioneering Dravidian temple architecture, rock-cut sculpture, the Pallava script, and contacts a…

Palm-leaf manuscript Manuscripts written on dried, prepared palm leaves and used across South and Southeast Asia; inscribed with a stylus, rubbed with ink, and bound into long, landscape-format codices…

Pandya dynasty Ancient Tamil ruling dynasty of southern India, one of the three classical Tamil kingdoms; noted for maritime trade, pearl fisheries, patronage of Tamil literature and long associa…

Papyrus: ancient Egyptian writing material and reed product Papyrus Papyrus is a layered writing material made from the Cyperus papyrus reed, developed in ancient Egypt from the 3rd millennium BC and used across the Mediterranean for documents, art…

Paris Peace Treaties (1947) Paris Peace Treaties, 1947 Multilateral agreements signed February 10, 1947, that settled wartime relations with Italy, Romania, Hungary, Bulgaria and Finland and defined territorial, military, and reparatio…

Parthia: The Arsacid Empire of Ancient Iran Parthia Parthia was an ancient Iranian state ruled by the Arsacid dynasty (c.247 BC–AD 224). Renowned for cavalry tactics and control of trade routes, it formed a major power between Helle…

Parthian language: an overview of the ancient Iranian tongue Parthian language Parthian was a Middle Iranian language of the northeast Iranian region (Parthia), used chiefly during the Parthian (Arsacid) period. It left inscriptions, coins and many loanwords…

Partition of India (1947): division, migration, and legacy Partition of India The 1947 Partition divided British India into India and Pakistan, triggering mass migration, communal violence, territorial disputes—most notably over Kashmir—and long-lasting poli…

Partitions of Poland (Polish–Lithuanian Commonwealth, 1772–1795) Partitions of Poland Three late-18th-century divisions of the Polish–Lithuanian Commonwealth by Russia, Prussia and Habsburg Austria that erased the state until 1918 and shaped Central European politic…

Past (time): concept, study, and cultural meanings Past The past comprises events and states that have already occurred. This article explains the concept, how it is studied, how societies remember it, and how it appears in culture and…

Patiala State (Phulkian princely state of Punjab) Patiala state Patiala was a Phulkian Sikh princely state in the Punjab region from the early 18th century until 1948, ruled by descendants of Chaudhary Phul and noted for its political role, cul…

Pax Romana: Rome’s two-centuries of relative peace and stability Pax Romana Pax Romana (27 BC–AD 180) was a prolonged era of relative stability across the Roman Empire marked by secure borders, flourishing commerce, public works, legal reform and cultural…

Peace of Augsburg (1555) Peace of Augsburg A 1555 settlement in the Holy Roman Empire that legally recognised Lutheranism alongside Catholicism under the principle 'cuius regio, eius religio', but left unresolved conflicts…

Peace of Münster 1648 treaty between Spain and the Dutch Republic that ended the Eighty Years' War and formally recognized Dutch independence; part of the wider Peace of Westphalia settlement.

Treaty of Paris (1814) — Peace that ended the war with the Sixth Coalition Peace of Paris (1814) The 1814 Treaty of Paris ended France's war with the Sixth Coalition, restored the Bourbon monarchy, fixed France's borders largely to 1792 lines, and set the stage for the Congres…

Peace of Westphalia (1648): treaties ending the Thirty and Eighty Years' Wars Peace of Westphalia Series of treaties concluded in 1648 that ended major European wars, recognized new territorial and religious arrangements, and influenced the development of modern state sovereign…

Pechenegs (Patzinaks): A Turkic Steppe People Pechenegs Overview of the Pechenegs (Patzinaks), a semi-nomadic Turkic people of the Eurasian steppes: origins, society, military role, interactions with Byzantium and Rus', decline and lega…

Peloponnesian War (431–404 BC): Athens versus Sparta Peloponnesian War A prolonged conflict (431–404 BC) between the Athenian maritime empire and the Peloponnesian League under Sparta that reshaped Greek politics through sieges, naval campaigns, the S…

Peninsular War (1807–1814): Conflict on the Iberian Peninsula Peninsular War A major theater of the Napoleonic Wars fought across Spain and Portugal (1807–1814), notable for British intervention, widespread guerrilla resistance and its contribution to Napol…

Penny Black — the world's first adhesive postage stamp Penny Black The Penny Black, introduced by the United Kingdom in 1840, was the first adhesive postage stamp. This article explains its design, printing, use, distribution, and significance for…

Penny Lilac (British one‑penny postage stamp) Penny Lilac British Penny Lilac definitive stamp first issued 12 July 1881. A lilac one‑penny Victorian stamp that became the standard letter rate issue through Queen Victoria's reign and rema…