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In Western Eurasia (Europe and Near East), the first millennium was a time of great transition from Classical Antiquity to the Middle Ages. The 1st century saw the peak of the Roman Empire, followed by its gradual decline during the period of Late Antiquity, the rise of Christianity and the Great Migrations.
The list below includes links to articles with further details for each decade, century, and millennium from 13,000 BC to AD 3000.
5 mag 2024 · Millennium, a period of 1,000 years. The Gregorian calendar, put forth in 1582 and subsequently adopted by most countries, did not include a year 0 in the transition from bc (years before Christ) to ad (those since his birth). Thus, the 1st millennium is defined as spanning years 1–1000 and the 2nd.
- The Editors of Encyclopaedia Britannica
The Julian calendar—the prevalent calendar in the Christian world for the first millennium CE and part of the second millennium—was an improvement over the Roman republican calendar that it replaced, but it was 11 minutes and 14 seconds longer than the tropical year (the time it takes the Sun to return to the same position, as seen from Earth).
- The Editors of Encyclopaedia Britannica
The first calendars based on Zoroastrian cosmology appeared in the later Achaemenid period (650 to 330 BC). They evolved over the centuries, but month names changed little until now.
The 1st millennium was a millennium of the Julian calendar that began on January 1, 1 AD, and ended on December 31, 1000. It is distinct from the 0s millennium, which had 999 years that began on...
The first millennium began on 1 January AD 1; the second millennium began on 1 January 1001; the third millennium will therefore begin on new year's day 2001. Years are grouped in tens, starting with one and ending with ten, for there was no year zero.
