320s
The 320s decade ran from January 1, 320, to December 31, 329.
| Millennium: | 1st millennium |
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Events
320
By place
Roman Empire
- Crispus, eldest son of Constantine I, leads a victorious campaign against the Franks, assuring twenty years of peace along the Rhine frontier. He establishes his residence in Augusta Treverorum (modern Trier), capital of Germania.
- Licinius reneges on the religious freedom promised by the Edict of Milan, and begins a new persecution of Christians in the Eastern Roman Empire. He imprisons Christians, confiscates their properties and destroys churches.
Asia
- King Chandragupta I founds the Gupta dynasty in northern India.
- Zhang Shi (張寔), Zhang Duke of Xiping and governor of Liang Province, (涼州)is assassinated by Yan She (閻涉) and Zhao Ang (趙卬) and replaced by Zhang Mao (張茂), commonly accepted first ruler of the Chinese state Former Liang.
By topic
Culture and Religion
- In Nydam Mose (Denmark), the Nydam oak boat is sacrificed by the Danes (the boat is excavated in the 1830s, when a local farmer finds weapons, including swords and spears).
- December 25 is introduced as the birthday of Jesus.
Science
- October 18 – Pappus of Alexandria, Greek philosopher, observes an eclipse of the sun and writes a commentary on The Great Astronomer (Almagest).
321
By topic
Roman Empire
- Emperor Constantine I expels the Goths from the Danube frontier and repairs Trajan's Bridge. He leads an expedition into the old province Dacia (modern Romania) and makes peace with the barbarians.
- March 7 - Constantine I signs legislation directing urban residents to refrain from work, and businesses to be closed, on the "venerable day of the Sun". An exception is made for agriculture.
Asia
- Tuoba Heru launches a coup d'état against his cousin Tuoba Yulü, and becomes the new Prince of Dai.
By topic
Food and Drink
- Constantine I assigns convicts to grind Rome's flour, in a move to hold back the rising price of food in an empire whose population has shrunk as a result of plague (see 309 AD).
Religion
- The Christian Church is allowed to hold property.
- A synod held in Alexandria condemns Arianism.
- Jews in today's Germany are documented for the first time, in Colonia Agrippinensium (moder-day Cologne).
322
By topic
Technology
- The first dependable representation of a horse rider with paired stirrups is found in China, in a Jin Dynasty tomb.
323
By place
Roman Empire
- Emperor Constantine the Great defeats the invading Goths and Sarmatians north of the Danube in Dacia, and claims the title of Sarmaticus Maximus.
China
- Crown Prince Ming of Jin succeeds his father Yuan of Jin as emperor of the Eastern Jin Dynasty.
324
By place
Roman Empire
- July 3 – Battle of Adrianople: Emperor Constantine the Great defeats his rival Licinius near Adrianople, forcing him to retreat to Byzantium. He invades Thrace with a Visigothic force and raids the countryside. This sees Constantine ruling as sole Emperor.
- July – Battle of the Hellespont: Crispus destroys Licinius' naval fleet in the Dardanelles, allowing his father Constantine the ability to cross over the Bosphorus into Asian provinces. Byzantium is besieged and Licinius assembles a second military force, under his newly elevated co-emperor Martinian at Lampsacus (modern-day Lapseki).
- September 18 – Battle of Chrysopolis: Constantine I definitively defeats Licinius at Chrysopolis, and becomes sole Emperor, thus ending the period of the Tetrarchy. Licinius escapes and gathers around 30,000 of his surviving troops at Nicomedia.
- December 19 – Licinius abdicates his position as Emperor. He is pardoned by Constantine I as a result of the supplication of his wife Constantia (who is Constantine's halfsister), and banished to Thessalonica as a private citizen.
325
By place
Roman Empire
- Emperor Constantine I personally assures the security of the Danube frontier by defeating the Goths, the Vandals, and the Sarmatians.
- Licinius is executed in Thessalonica, on a charge of conspiring and raising troops against Constantine I.
- Gladiatorial combat is outlawed in the Roman Empire.
China
- April 1 – Crown Prince Cheng of Jin, age 4, succeeds his father Ming of Jin as emperor of the Eastern Jin dynasty. During his reign, he is largely advised by regents, his uncle Yu Liang and high-level officials.
By topic
Art
- Constantine the Great, from the Basilica of Maxentius and Constantine, Rome, is started to be made. It is now kept at Palazzo dei Conservatori, Rome.
Religion
- May 20 – First Council of Nicaea: Constantine I summons an ecumenical council of bishops in Nicaea (Turkey). The Nicene Creed, adopted on June 19, declares that the members of the Trinity (the Father, the Son, and the Holy Spirit) are equal. The council decides that Easter is celebrated on the first Sunday after the first full moon after the vernal equinox. Arius is exiled to Illyria; his works are confiscated and consigned to the flames.
- The Church of the Nativity is built in Bethlehem.
326
By place
Roman Empire
- Emperor Constantine the Great travels to Rome to celebrate the 20th anniversary of his accession to power, but while en route at Pola he orders his older son, Crispus Caesar, to be executed, possibly on charges of adultery. Later, Fausta, second wife of Constantine I, is also executed by being suffocated in a hot bath.
- Constantine I founds Constantinople and incorporates Byzantium into the new capital. He reorganises the Roman army in smaller units classified into three grades: palatini, (imperial escort armies); comitatenses, (forces based in frontier provinces) and limitanei (auxilia border troops).
- Constantine I promulgates laws against the prostitution of maidservants, and for the humanization of prisons.
By topic
Art
- Constantine the Great, from the Basilica of Maxentius and Constantine in Rome, is finished. It is now kept at Palazzo dei Conservatori, Rome.
Religion
- September 14 (traditional date) – Helena, mother of Constantine I, discovers the so-called True Cross and the Holy Sepulchre (Jesus's tomb) in Jerusalem. On her pilgrimage, she pauses on the Aegean island of Patmos, where she is said to found the church of Panagia Ekatontapiliani.
- Helena tells Constantine that he must atone for executing his son and wife by building churches, and at about this date construction begins on Old St. Peter's Basilica, the first church on the traditional site of Saint Peter's tomb in Rome, and on the basilica of Golgotha on Calvary outside Jerusalem.
- Christianity is introduced to the Kingdom of Iberia (modern-day Georgia) by Saint Nino (approximate date).
327
By place
Roman Empire
- Emperor Constantine the Great decrees that rural slaves can only be sold in the province where they reside, in order to resolve the shortage of labour in the Roman Empire.
By topic
Religion
- Construction begins on the cathedral of Antioch (Syria).
- Approximate traditional date – Helena, mother of Constantine, returning from her pilgrimage to the Holy Land, founds Stavrovouni Monastery on Cyprus.
328
By place
Roman Empire
- July 5 – Constantine's Bridge, built over the Danube between Sucidava (Corabia, Romania) and Oescus (Gigen, Bulgaria), is officially opened by the Roman architect Theophilus Patricius.
- December 7 – Lakhmid king Imru' al-Qays ibn 'Amr dies. His epitaph, the Namara inscription, is an important source for the Arabic Language.
By topic
Religion
- May 9 – Alexandria's patriarch bishop Alexander dies and is succeeded by his deacon Athanasius.
329
By place
By topic
Significant people
Births
320
- Aurelius Victor, Roman historian and politician (approximate date)
- Constans I, Roman emperor (d. 350)
- Flavian I, Patriarch of Antioch (d. 404)
- Jin Jianwendi, emperor of the Jin Dynasty (d. 372)
- Oribasius, Greek physician (approximate date)
- Tuoba Shiyijian, prince of the Tuoba Dai (d. 376)
- Xie An, statesman of the Jin Dynasty (d. 385)
321
- Cheng of Jin (or Shigen), Chinese emperor (d. 342)
- Du Lingyang (or Chenggong), Chinese empress (d. 341)
- Valentinian I (the Great), Roman emperor (d. 375)
322
323
- Constans I, Roman consul and emperor (d. 350)
324
- Chu Suanzi, Chinese empress of the Jin dynasty (d. 384)
325
- Ammianus Marcellinus, Roman historian (approximate date)
- Procopius, Roman general and usurper (approximate date)
- Wang Meng (or Jinglüe), Chinese prime minister (d. 375)
326
- Constantius Gallus, Roman consul and statesman (d. 354)
- Murong Chui (or Daoming), Chinese general (d. 396)
327
328
- Flavius Julius Valens, Roman emperor (d. 378)
- Huan Chong, Chinese general and governor (d. 384)
- Yuan Hong, Chinese historian and politician (d. 376)
329
- Gregory Nazianzus, Greek Patriarch of Constantinople (d. 390)
Deaths
320
40 Martyrs of Sebaste
Saint Illuminata
Saint Proculus of Verona
- January 2 – Narcissus, Argeus, and Marcellinus, Roman Catholic martyrs and saints
- January 29 – Valerius of Trèves, Roman Catholic priest and saint
- February 6 – Dorothea of Alexandria, Roman Catholic virgin, martyr and saint
- March 9 – 40 Martyrs of Sebaste
- March 10 – Cyrion and Candidus, Armenian Orthodox priest and saints
- July 11 – Januarius and Pelagia, Roman Catholic priests, martyrs and saints
- November 29 – Saint Illuminata, Roman Catholic religious sister and saint
- December 9 – Proculus of Verona, Roman Catholic priest and saint
- Lactantius, Christian writer (approximate date)
- Sima Bao, prince of the Jin Dynasty (b. 294)
- Zhang Shi, Duke of Xiping
321
- Tuoba Yulü, Chinese prince of the Tuoba Dai
- Zu Ti (or Shizhi), Chinese general and adviser (b. 266)
322
- Philogonius (or Filogonius), bishop of Antioch
- Rabbah bar Rav Huna, Jewish Talmudist
- Xu Kan, Chinese bandit leader and warlord
- Yang Xianrong, Chinese empress
323
- January 3 – Yuan of Jin (or Jingwen), Chinese emperor (b. 276)
- Tiberius Julius Rhadamsades, Roman prince and client king
- Zhang Bin (or Mengsun), Chinese general and strategist
324
- Guo Pu, Chinese historian, poet and writer (b. 276)
- Wang Dun (or Chuzhong), Chinese warlord (b. 266)
- Zhang Mao, Chinese ruler of Former Liang (b. 277)
325
- October 18 – Ming of Jin, Chinese emperor (b. 299)
- Iamblichus, Syrian philosopher and writer (b. 245)
- Licinius, Roman consul and emperor (executed)
- Li Ju (or Shihui), Chinese general and warlord
- Sextus Martinianus, Roman Emperor (executed)
- Tuoba Heru, Chinese prince of the Tuoba Dai
326
- Flavius Julius Crispus, son of Constantine I (b. 303)
- Flavia Maxima Fausta, Roman empress (b. 289)
- Licinius II, Roman consul and caesar (b. 315)
- Liu (or Xianlie), Chinese empress of Han Zhao
327
Saint Awtel
- June 3 – Awtel, Eastern Christian monk and saint
- Cleopatra, Christian martyr and saint (or 319)
- Jonas and Barachisius, Persian martyrs
- Melitius of Lycopolis, Christian bishop
328
- Alexander I, pope and patriarch of Alexandria
- Papa (or Papa bar Aggai), Sassanid bishop
- Su Jun, Chinese general and politician
- Yu Wenjun, Chinese empress (b. 297)
329
- Han Huang, Chinese general and rebel
- Liu Xi, Chinese emperor of Han Zhao
- Liu Yao, Chinese emperor of Han Zhao
- Liu Yin, Chinese prince of Han Zhao
- Wen Jiao, Chinese general and governor
References
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