420

For the year, see 420 or 420 BC.

420 can also refer to:

• 420 (number)
• 420 (dinghy), in sailing, a class of doublehanded racing sailboats
• 420 (cannabis culture), a term used in North America as a discreet way to refer to cannabis
• April 20

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Upper Paleolithic
• 10th millennium BC | 9th millennium BC | 8th millennium BC
• 7th millennium BC | 6th millennium BC | 5th millennium BC

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As a means of recording the passage of time, the 4th century (per the Julian/Gregorian calendar and Anno Domini era) was that century which lasted from 301 to 400.

Overview

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The 5th century is the period from 401 to 500 in accordance with the Julian calendar in Anno Domini, the year of our Lord.

Overview

The Western Roman Empire is ruled by a succession of weak emperors, and true power falls increasingly into the hands of powerful generals.
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The 6th century is the period from 501 to 600 in accordance with the Julian calendar in the Christian Era. This century is widely considered to mark the end of Classical Antiquity and the beginning of the Dark Ages.
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list of decades which have articles with more information about them.

During the twentieth century, it became popular to look at that century's decades as historical entities in themselves.
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Centuries: 3rd century - 4th century - 5th century

360s 370s 380s - 390s - 400s 410s 420s
390 391 392 393 394
395 396 397 398 399

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Events and Trends

• Gildonic revolt in Africa Province (397–398)

Births

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Centuries: 4th century - 5th century - 6th century

370s 380s 390s - 400s - 410s 420s 430s
400 401 402 403 404
405 406 407 408 409

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Events and Trends

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Centuries: 4th century - 5th century - 6th century

380s 390s 400s - 410s - 420s 430s 440s
410 411 412 413 414
415 416 417 418 419

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Events and Trends

• Sack of Rome by the Visigoths under Alaric.

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Centuries: 4th century - 5th century - 6th century

390s 400s 410s - 420s - 430s 440s 450s
420 421 422 423 424
425 426 427 428 429

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Events and Trends

• Saint Augustine of Hippo publishes The City of God.

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Centuries: 4th century - 5th century - 6th century

400s 410s 420s - 430s - 440s 450s 460s
430 431 432 433 434
435 436 437 438 439

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Events and Trends

• Buddhagosha writes the Visuddhimagga in Sri Lanka (approximate date).

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Centuries: 4th century - 5th century - 6th century

410s 420s 430s - 440s - 450s 460s 470s
440 441 442 443 444
445 446 447 448 449

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Events and Trends

• Armorica rebels against the Roman empire.

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Centuries: 4th century - 5th century - 6th century

420s 430s 440s - 450s - 460s 470s 480s
450 451 452 453 454
455 456 457 458 459

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Events and Trends

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This page indexes the individual years pages.

Twenty-first century

2100 - 2099 - 2098 - 2097 - 2096 - 2095 - 2094 - 2093 - 2092 - 2091

2090 - 2089 - 2088 - 2087 - 2086 - 2085 - 2084 - 2083 - 2082 - 2081

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5th century · 6th century
380s 390s 400s 410s 420s 430s 440s
414 415 416 417 418 419 420
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5th century · 6th century
380s 390s 400s 410s 420s 430s 440s
415 416 417 418 419 420 421
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5th century · 6th century
380s 390s 400s 410s 420s 430s 440s
416 417 418 419 420 421 422
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5th century · 6th century
390s 400s 410s 420s 430s 440s 450s
418 419 420 421 422 423 424
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5th century · 6th century
390s 400s 410s 420s 430s 440s 450s
419 420 421 422 423 424 425
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5th century · 6th century
390s 400s 410s 420s 430s 440s 450s
420 421 422 423 424 425 426
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Vandals - Gunderic, King of the Vandals (407-428)
• Visigoths - Theodoric I, King of the Visigoths (419-451)
• Western Roman Empire - Honorius, Western Roman Emperor (395-423)

Middle East

• Eastern Roman Empire

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Gregorian calendar is the most widely used calendar in the world. A modification of the Julian calendar, it was first proposed by the Calabrian doctor Aloysius Lilius, and was decreed by Pope Gregory XIII, for whom it was named, on 24 February 1582 via the papal bull
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Ab Urbe condita (literally, "from the city, having been founded") is a monumental history of Rome, from its legendary founding (ab Urbe condita, dated to 753 BC by Varro and most modern scholars). The book was written by Titus Livius (around 59 BC–AD 17).
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Armenian calendar uses the Armenian numerals. It begins in AD 552 as the start of the Armenian era.

Dates are marked by the letters ԹՎ
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Buddhist calendar is used on mainland Southeast Asia in the countries of Cambodia, Laos, Thailand, Myanmar (formerly Burma) and Sri Lanka in several related forms. It is a lunisolar calendar having months that are alternately 29 and 30 days, with an intercalated day and a 30-day
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Chinese calendar is a lunisolar calendar, incorporating elements of a lunar calendar with those of a solar calendar. In China today, the Gregorian calendar is used for most day to day activities, but the Chinese calendar is still used for marking traditional Chinese holidays such
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The Chinese sexagenary cycle (Chinese: 干支; Pinyin: gānzhī) is a cyclic numeral system of 60 combinations of the two basic cycles, the ten Heavenly Stems (天干;
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The Chinese sexagenary cycle (Chinese: 干支; Pinyin: gānzhī) is a cyclic numeral system of 60 combinations of the two basic cycles, the ten Heavenly Stems (天干;
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Coptic calendar, also called the Alexandrian calendar, is used by the Coptic Orthodox Church. This calendar is based on the ancient Egyptian calendar. To avoid the calendar creep of the latter, a reform of the ancient Egyptian calendar was introduced at the time of Ptolemy
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Ethiopian calendar (Amharic: የኢትዮጵያ ዘመን አቆጣጠር ye'Ītyōṗṗyā zemen āḳoṭaṭer), also called the
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