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- DaimyoPowerful feudal territorial lord in pre-modern Japan
- Dál RiataGaelic kingdom in western Scotland and northeastern Ireland
- Dali KingdomFormer Bai state
- DamasceningArt of inlaying metals
- Damascus steelType of steel used in Middle Eastern swordmaking
- DamnoniiThe Damnonii (also referred to as Damnii) were a Brittonic people of the late 2nd century
- DanegeldTax raised to pay tribute to Viking raiders
- DanelawPart of England where Danish law applied
- DantidurgaFounder of the Rashtrakuta Empire
- Darbazi (State Council)The Darbazi (Georgian: დარბაზი) was the medieval Georgian council of state, introduced by
- Darwin ParkDarwin Park is a residential complex and suburb of Lichfield in the Lichfield District in
- David of TamanA purported Khazar ruler of the late tenth century CE who ruled over a Khazar successor-st
- De delictis gravioribusDe delictis gravioribus (Latin for "On more serious crimes") is a letter written on 18 May
- Decline and modernization of the Ottoman EmpireIn the 19th century, the Ottoman Empire faced threats on numerous frontiers from multiple
- Decline of Buddhism in the Indian subcontinentGradual process of replacement of in India, ended around the 13th or 14th century
- Decline of the Byzantine EmpireSequence of historical events
- Decree (Catholic canon law)A decree (Latin: decretum, from decerno, 'I judge') is, in a general sense, an order or la
- Delegata potestas non potest delegariDelegata potestas non potest delegari is a principle in constitutional and administrative
- Delhi SultanateLate medieval empire in the Indian subcontinent (1206–1526)
- Demak SultanateJavanese Sultanate in 16th century
- Despenser's Crusade14th-century military campaign
- Despotate of Dobruja14th century quasi-independent polity
- DeterminatioA determinatio is an authoritative determination by the legislator concerning the applicat
- Dicastery for Promoting Integral Human DevelopmentThe Dicastery for Promoting Integral Human Development (Dicasterium ad integram humanam pr
- Dicastery for the Causes of SaintsCatholic Church dicastery overseeing the process of canonization of saints
- Dicastery for the Laity, Family and LifeThe Dicastery for the Laity, Family and Life is a dicastery of the Roman Curia. Pope Franc
- Diet (assembly)Type of deliberative assembly
- Dignitas connubiiDignitas connubii is an instruction issued by the Pontifical Council for Legislative Texts
- Dikwa EmirateThe Dikwa Emirate is one of the successor states to the old Bornu Empire, a traditional st
- Dimasangcay AdelSultan Dimasangcay Adel (alternative spelling Dimasangkay Adil, reigning 1578-1585) was th
- DinarMonetary currency unit of some countries
- Diocese of HispaniaThe Diocese of Hispania was a late antique administrative unit (Dioecesis) of the Roman Em
- DirhamUnit of currency in several Asian and African states
- DiumaDiuma (or Dwyna or Duma) was the first Bishop of Mercia in the Anglo-Saxon Kingdom of Merc
- Division of the Mongol EmpireFragmentation of the Mongol Empire post-1259
- Djidjelli expeditionThe Djidjelli expedition was a 1664 military expedition by Louis XIV to seize the port of
- Dobin am SeeDobin am See is a municipality in the Ludwigslust-Parchim district, in Mecklenburg-Vorpomm
- Donation (Catholic canon law)A donation, in the context of the canon law of the Roman Catholic Church, is the gratuitou
- Donation of ConstantineForged Roman imperial decree
- Dongdan Kingdom926–930 puppet state in Manchuria
- Dongola ReachThe Dongola Reach is a reach of approximately 160 km in length stretching from the Fourth
- Doukas (historian)Doukas or Dukas (c. 1400 – after 1462) was a Byzantine Greek historian who flourished unde
- Drenther Crusade1228 Catholic military campaign against the inhabitants of Drenthe (modern Netherlands)
- Ducal Palace of ModenaThe Ducal Palace of Modena is a Baroque palace in Modena, Italy. It was the residence of t
- Ducal Palace of SassuoloThe Ducal Palace in Sassuolo is a Baroque villa located in the town of Sassuolo, thirty mi
- Duchies of SilesiaDivisions of the region of Silesia
- Duchy of BohemiaHistorical state
- Duchy of Brabant1183–1794 northwestern state of the Holy Roman Empire
- Duchy of BrittanyMedieval feudal state in northwest France
- Duchy of BurgundyVassal territory of France, 918–1482
- Duchy of CroatiaEuropean state, 7/8th century to c. 925
- Duchy of LorrainePart of East Francia and Holy Roman Empire
- Duchy of MilanFormer duchy in Italy (1395–1447; 1450–1796)
- Duchy of PłockThe Duchy of Płock was a feudal district duchy in Masovia, centered on the Płock Land. Its
- Duchy of Pomerania-StolpThe Duchy of Pomerania-Stolp, also known as the Duchy of Stolp, and the Duchy of Słupsk, w
- Duchy of RawaThe Duchy of Rawa was a feudal district duchy in Masovia, centered on the Rawa Land. Its c
- Duchy of RomeDuchy in Byzantine Empire
- Duchy of SavoyDuchy in Western Europe (1416–1860
- Duchy of SorrentoThe Duchy of Sorrento was a small peninsular duchy of the Early Middle Ages centred on the
- Duchy of SpoletoMedieval duchy in central Italy, circa 570–1201
- Duchy of UrbinoVassal of Papal States
- Duchy of WiznaDuchy of Wizna was a district principality and a fiefdom within the United Kingdom of Pola
- Duke of BerryTitle in the French peerage
- Duke of BourbonFrench aristocratic title
- Duke of CalabriaItalian nobility title
- Duke of ClarenceDuke of Clarence was a substantive title created three times in the Peerage of England. Th
- Duke of NemoursTitle in the Peerage of France
- Duke of OrléansTitle of French nobility
- DunhuaDunhua (Chinese: 敦化; Korean: 돈화) is a county-level city of the Yanbian Korean Autonomous P
- Dvaravati7th to 11th-century Mon civilization