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- Raj of Sarawak1841–1946 kingdom on northern Borneo
- Ram Khamhaeng InscriptionEarly Thai inscription
- Rape of HastingsThe Rape of Hastings (also known as Hastings Rape) is one of the rapes, the traditional su
- Rashidun armyArmed forces of the Muslim Rashidun Caliphate
- Rashidun CaliphateFirst Islamic caliphate (632–661)
- Rashtrakuta EmpireEarly medieval Indian dynasty (753–982)
- Rebellion of the Alpujarras (1499–1501)Uprisings by Muslims in southern Iberia
- Reconquest of Constantinople1261 battle between the Latin and Nicaean Empires
- ReconquistaMedieval Christian military campaigns (722–1492)
- Red Turban RebellionsRevolt against the Yuan dynasty in China (1351–1368)
- Religion in ThailandBuddhism is the predominant religion in Thailand. It is practised by more than 90% of the
- Religious order (Catholic)Catholic religious community living under solemn vows
- Religious significance of JerusalemReligious ties to a specific geography
- Renaissance LatinLatin as spoken and written in the Renaissance
- Renaissance of the 12th centuryPeriod during the High Middle Ages of European history
- Renovatio imperii RomanorumRenovatio imperii Romanorum ("renewal of the empire of the Romans") was a formula declarin
- Republic of AnconaItalian maritime republic (11th century–1532)
- Republic of FlorenceCity-state on the Italian Peninsula (1115–1569)
- Republic of GenoaItalian maritime republic (1099–1797)
- Republic of PisaItalian maritime republic (c. 1000–1406)
- Republic of Ragusa1358–1808 maritime republic in Southern Europe (Dalmatia)
- Republic of SienaItalian republic (1125–1555)
- Republic of VeniceMaritime republic in Italy (697–1797)
- Rhos (North Wales)Rhos (Welsh for 'moor' / 'moorland') is a region to the east of the River Conwy in North W
- Riau-Lingga Sultanate1824–1911 Malay sultanate in Southeast Asia
- RibatSmall fortification
- Ridda WarsSeries of military campaigns launched by Abu Bakr against rebel Arab tribes
- Right of OptionIn Catholic canon law, Right of Option is a way of obtaining a benefice or a title, by the
- Rise of the Ottoman EmpireOttoman state before 1453
- River HuntspillThe River Huntspill (or Huntspill River) is an artificial river, in the Somerset Levels, i
- Robert CurthoseDuke of Normandy from 1087 to 1106
- Roger de MoulinsRoger de Moulins was the eighth Grand Master of the Knights Hospitaller from 1177 until hi
- Rögnvald Kali's Crusade1152–1155 religious war
- Roman CuriaAdministrative institutions of the Holy See
- Roman scudoThe Roman scudo (plural: scudi romani) was the currency of the Papal States until 1866. It
- Romanization of PersianRepresentation of the Persian language with the Latin script
- RomerikeRomerike is a traditional district located north-east of Oslo, in what is today south-east
- Route from the Varangians to the GreeksMedieval trade route between Scandinavia and the Eastern Roman Empire
- Royal intermarriagePractice of ruling dynasties marrying into other reigning families
- Royal Thai PoliceNational law enforcement agency
- Royal Villa of MonzaThe Royal Villa (Italian: Villa Reale) is a historical building in Monza, Northern Italy.
- Rudolf I, Duke of Saxe-WittenbergRudolf I (c. 1284 – 12 March 1356), a member of the House of Ascania, was Duke of Saxe-Wit
- Rukun NegaraMalaysian declaration of national philosophy
- Rump stateReduced territory of a once-larger state
- RurikidsNoble lineage and rulers of Kievan Rus'
- Russian DalianTerritory of Imperial Russia from 1898 to 1905
- Russian Expeditionary Force in FranceMilitary unit
- Russian OrthodoxyRussian Orthodoxy (Russian: Русское православие) is the theology, religious traditions, an
- RutheniaMedieval exonym for Rus'