| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| AD 1 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | AD 1 I |
| Ab urbe condita | 754 |
| Assyrian calendar | 4751 |
| Balinese saka calendar | N/A |
| Bengali calendar | −592 |
| Berber calendar | 951 |
| Buddhist calendar | 545 |
| Burmese calendar | −637 |
| Byzantine calendar | 5509–5510 |
| Chinese calendar | 庚申年 (Metal Monkey) 2698 or 2491 — to — 辛酉年 (Metal Rooster) 2699 or 2492 |
| Coptic calendar | −283 – −282 |
| Discordian calendar | 1167 |
| Ethiopian calendar | −7 – −6 |
| Hebrew calendar | 3761–3762 |
| Hindu calendars | |
| - Vikram Samvat | 57–58 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3101–3102 |
| Holocene calendar | 10001 |
| Iranian calendar | 621 BP – 620 BP |
| Islamic calendar | 640 BH – 639 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 1 I |
| Korean calendar | 2334 |
| Minguo calendar | 1911 before ROC 民前1911年 |
| Nanakshahi calendar | −1467 |
| Seleucid era | 312/313 AG |
| Thai solar calendar | 543–544 |
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 127 or −254 or −1026 — to — 阴金鸡年 (female Iron-Rooster) 128 or −253 or −1025 |
AD 1 (I) or 1 CE was a common year starting on Saturday or Sunday,[note 1] a common year starting on Saturday by the proleptic Julian calendar, and a common year starting on Monday by the proleptic Gregorian calendar. It is the epoch year for the Anno Domini (AD) Christian calendar era, and the 1st year of the 1st century and 1st millennium of the Christian or Common Era (CE).
In the Roman Empire, AD 1 was known as the "Year of the consulship of Gaius Caesar and Lucius Paullus",[1] and less frequently, as the year AUC 754 (see ab urbe condita). The denomination "AD 1" for this year has been in consistent use since the mid-medieval period when the Anno Domini (AD) calendar era became the prevalent method in Europe for naming years. It was the beginning of the Christian era/common era. The preceding year is 1 BC; there is no year 0 in this numbering scheme. The Anno Domini dating system was devised in AD 525 by Dionysius Exiguus.
The Julian calendar, a 45 BC reform of the Roman calendar, was the calendar used by Rome in AD 1.
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