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|450 by topic|
|Ab urbe condita||1203|
|Balinese saka calendar||371–372|
|Chinese calendar||己丑年 (Earth Ox)
3146 or 3086
— to —
庚寅年 (Metal Tiger)
3147 or 3087
|- Vikram Samvat||506–507|
|- Shaka Samvat||371–372|
|- Kali Yuga||3550–3551|
|Iranian calendar||172 BP – 171 BP|
|Islamic calendar||177 BH – 176 BH|
|Minguo calendar||1462 before ROC
|Seleucid era||761/762 AG|
|Thai solar calendar||992–993|
576 or 195 or −577
— to —
577 or 196 or −576
Year 450 (CDL) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar, the 450th Year of the Common Era (CE) and Anno Domini (AD designations, the 450th year of the 1st millennium, the 50th year of the half of 5th century, and the 1st year of the 450s decade. At the time, it was known as the Year of the Consulship of Valentinianus and Avienus (or, less frequently, year 1203 Ab urbe condita). The denomination 450 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.
- Spring – Justa Grata Honoria, eldest sister of emperor Valentinian III, sends her ring to Attila the Hun in an effort to escape a marriage being forced upon her by her brother. Now about 34, she has had an affair with an officer in her household and has allegedly plotted to overthrow Valentinian, who has sent her to a convent at Constantinople. Attila announces his intention to marry her, says he expects to be given half the Western Roman Empire as her dowry, and gathers a large Hun invasion force. Flavius Aetius, Roman general (magister militum), musters in Gaul an army of Burgundians, Celts, Ripuarians, Salian Franks and Visigoths under the command of the Visigoth king Theodoric I.
- July 28 – Emperor Theodosius II, age 49, falls from his horse while hunting at Constantinople and dies soon afterward. He reigned since 408, mostly under the domination of his Christian sister Pulcheria, who has been allowed to return to court (see 441).
- August 25 – Pulcheria is forced to marry and co-rule the Eastern Roman Empire. She gives the imperial diadem to the Illyrian (or Thracian) officer and senator Marcian, age 58, and is crowned as empress in the Hippodrome at Constantinople, in a first religious coronation ceremony.
- Marcian orders the execution (or assassination) of the unpopular court eunuch Chrysaphius. He discontinues the tribute payments to Attila.
- All the Temples of Aphrodisias (City of Goddess Aphrodite) are demolished and its libraries burned down. The city is renamed Stauroupolis (City of the Cross).
- Angles, Saxons and Jutes invade Britain, marking the beginning of the Old English period (approximate date).
- Remodelling begins of the Dome of Baptistry of Neon, Ravenna (Italy) (approximate date).
- King Yazdegerd II summons the leading Armenian nobles to the Persian capital Ctesiphon, pressuring them to cut their ties with the Western Church.
- Metal horseshoes come into more common use in the Near East and in Europe, increasing the efficiency of horsepower in agriculture and transportation.
- Hawaii Loa, Polynesian chief, discovers what will be called the Hawaiian Islands; he sails across 2,400 miles of open water from the island of Raiatea, near Tahiti. He settles on Hawaii, named in his honor (approximate date).
- February 2 – Justin I, Byzantine Emperor (d. 527)
- Ariadne, Byzantine Empress (approximate date)
- Avitus, archbishop of Vienne (approximate date) (d. 518)
- Chilperic II, king of Burgundy (approximate date)
- Gunthamund, king of the Vandals (d. 496)
- Isidore, Neoplatonist philosopher (approximate date)
- Pope Hormisdas (approximate date)
- Thrasamund, king of the Vandals (d. 523)
- July 28 – Theodosius II, Roman Emperor (b. 401)
- July 31 – Peter Chrysologus, bishop of Ravenna
- November 27 – Galla Placidia, Roman Empress (b. 392)
- Chrysaphius, eunuch and chief minister
- Cui Hao, prime minister of Northern Wei
- Chlodio, semi legendary Frankish king and supposed great-grandfather of Clovis I (approximate date) (b.390)
- Kālidāsa, Classical Sanskrit writer (approximate date)
- Quodvultdeus, bishop of Carthage (approximate date)
- Socrates Scholasticus, church historian (approximate date)
- Sozomen, church historian (approximate date)
- Ronald Grigor Suny, The Making of the Georgian Nation, (Indiana University Press, 1994), 23.
- Basa Banyumasan
- Беларуская (тарашкевіца)
- Emiliàn e rumagnòl
- বিষ্ণুপ্রিয়া মণিপুরী
- Bahasa Indonesia
- Kreyòl ayisyen
- Кырык мары
- Bahasa Melayu
- नेपाल भाषा
- Norsk bokmål
- Norsk nynorsk
- Олык марий
- Runa Simi
- Sesotho sa Leboa
- Српски / srpski
- Srpskohrvatski / српскохрватски
- Tiếng Việt
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