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| Millennium: | 1st millennium |
|---|---|
| Centuries: |
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| Decades: |
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| Years: |
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| 257 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 257 CCLVII |
| Ab urbe condita | 1010 |
| Assyrian calendar | 5007 |
| Balinese saka calendar | 178–179 |
| Bengali calendar | −336 |
| Berber calendar | 1207 |
| Buddhist calendar | 801 |
| Burmese calendar | −381 |
| Byzantine calendar | 5765–5766 |
| Chinese calendar | 丙子年 (Fire Rat) 2954 or 2747 — to — 丁丑年 (Fire Ox) 2955 or 2748 |
| Coptic calendar | −27 – −26 |
| Discordian calendar | 1423 |
| Ethiopian calendar | 249–250 |
| Hebrew calendar | 4017–4018 |
| Hindu calendars | |
| - Vikram Samvat | 313–314 |
| - Shaka Samvat | 178–179 |
| - Kali Yuga | 3357–3358 |
| Holocene calendar | 10257 |
| Iranian calendar | 365 BP – 364 BP |
| Islamic calendar | 376 BH – 375 BH |
| Javanese calendar | 136–137 |
| Julian calendar | 257 CCLVII |
| Korean calendar | 2590 |
| Minguo calendar | 1655 before ROC 民前1655年 |
| Nanakshahi calendar | −1211 |
| Seleucid era | 568/569 AG |
| Thai solar calendar | 799–800 |
| Tibetan calendar | 阳火鼠年 (male Fire-Rat) 383 or 2 or −770 — to — 阴火牛年 (female Fire-Ox) 384 or 3 or −769 |
Year 257 (CCLVII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Gallienus (or, less frequently, year 1010 Ab urbe condita). The denomination 257 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
