January 1 in History
It is also Holiday or observance: New Year's Day. A U.S. federal holiday marking the beginning of the Gregorian calendar year. Many people gather with family and friends and set intentions for the year ahead..

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Ali al-Ridha, 8th Imam of Twelver Shia Islam was born in 766, while Lucius Aelius, adopted son and intended successor of Hadrian died in 138.

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Born on January 1
- 766 — Ali al-Ridha, 8th Imam of Twelver Shia Islam (died 818)
- 1431 — Pope Alexander VI (died 1503)
- 1449 — Lorenzo de' Medici, Italian politician (died 1492)
Died on January 1
- 138 — Lucius Aelius, adopted son and intended successor of Hadrian (born 101)
- 404 — Telemachus, Christian monk and martyr
- 898 — Odo I, Frankish king (born 860)
Source: Wikipedia historical listings for January 1
Quick answers
What holiday is on January 1? Holiday or observance: New Year's Day. A U.S. federal holiday marking the beginning of the Gregorian calendar year. Many people gather with family and friends and set intentions for the year ahead..
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This calendar is live and has its own date controls; it is separate from the January 1 historical article above.

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