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| Millennia: | 1st millennium BC · 1st millennium AD · 2nd millennium AD |
| Centuries: | 1st century · 2nd century · 3rd century · 4th century · 5th century · 6th century · 7th century · 8th century · 9th century · 10th century |
The first millennium is a period of time that commenced on January 1, 1, and ended on December 31, 1000, of the Julian calendar. This millennium is the beginning of the Anno Domini/Common Era for this calendar as there is no "year zero."
The early first millennium marks the peak of the Roman Empire and its subsequent decline. In analysis grouping history by period this same era is a period of transition also known as Late Antiquity, culminating in the transformation of the Eastern Roman Empire into the Byzantine Empire, while the Western Roman Empire collapses, giving rise to the Early Middle Ages.
As the millennium ages, Christianity and Islam rise to power in the 4th and 7th centuries, respectively. The late 1st millennium sees the Vikings incursions and settlements, founding of the Carolingian dynasties, and as the millennium closes, the gradual transition to what is known as the High Middle Ages.
World population, which had tripled over the preceding millennium, grew more slowly during the thousand year era and could well have diminished. One optimistic estimate the world's population rose from approximately 170 to 300 million, but other estimates vary; one estimate suggests that the world population actually declined from 400 million people to 250 million people.
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