The 320s decade ran from January 1, 320, to December 31, 329.
The 270s decade ran from January 1, 270, to December 31, 279.
The 360s decade ran from January 1, 360, to December 31, 369.
The 330s decade ran from January 1, 330, to December 31, 339.
The 340s decade ran from January 1, 340, to December 31, 349.
Year 648 (DCXLVIII) was a leap year starting on Tuesday of the Julian calendar. The denomination 648 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 300 (CCC) was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Valerius. The denomination 300 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 386 (CCCLXXXVI) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Honorius and Euodius. The denomination 386 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 290 (CCXC) was a common year starting on Wednesday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Valerius and Valerius. The denomination 290 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 291 (CCXCI) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberianus and Dio. The denomination 291 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 365 (CCCLXV) was a common year starting on Saturday of the Julian calendar. At the time, it was known in the West as the Year of the Consulship of Augustus and Valens. The denomination 365 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 350 (CCCL) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Sergius and Nigrinianus. The denomination 350 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 343 (CCCXLIII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Memmius and Romulus. The denomination 343 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 341 (CCCXLI) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcellinus and Probinus. The denomination 341 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years or dates.
Year 340 (CCCXL) was a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Acindynus and Valerius. The denomination 340 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 337 (CCCXXXVII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Felicianus and Titianus. The denomination 337 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 320 (CCCXX) was a leap year starting on Friday of the Julian calendar.
Pope Vitalian was the bishop of Rome from 30 July 657 to his death. His pontificate was marked by the dispute between the papacy and the imperial government in Constantinople over Monothelitism, which Rome condemned. Vitalian tried to resolve the dispute and had a conciliatory relationship with Emperor Constans II, who visited him in Rome and gave him gifts. Vitalian's pontificate also saw the secession of the Archbishopric of Ravenna from the papal authority.
Constans II, nicknamed "the Bearded", was the Byzantine emperor from 641 to 668. Constans was the last attested emperor to serve as consul, in 642, although the office continued to exist until the reign of Leo VI the Wise. His religious policy saw him steering a middle line in disputes between the Orthodoxy and Monothelitism by refusing to persecute either and prohibited discussion of the natures of Jesus Christ under the Type of Constans in 648. His reign coincided with Muslim invasions under, Umar, Uthman, and Mu'awiya I in the late 640s to 660s. Constans was the first emperor to visit Rome since the fall of the Western Roman Empire in 476, and the last one to visit Rome while it was still held by the Empire.
Emperor Cheng of Jin, personal name Sima Yan (司馬衍), courtesy name Shigen (世根), was an emperor of the Chinese Eastern Jin dynasty. He was the eldest son of Emperor Ming and became the crown prince on April 1, 325. During his reign, the administration was largely dominated by a succession of regents—initially his uncle Yu Liang, then Wang Dao, then the joint administration of He Chong and another uncle Yu Bing (庾冰). He became emperor at age four, and soon after his accession to the throne, the disastrous rebellion of Su Jun weakened Jin forces for decades.
