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Millennium: 1st millennium
257 in various calendars
Gregorian calendar 257
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(Fire Rat)
2953 or 2893
    — to —
丁丑年 (Fire Ox)
2954 or 2894
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
Korean calendar 2590
Minguo calendar 1655 before ROC
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 —
(female Fire-Ox)
384 or 3 or −769
Golden Roman helmet found near Sirmium (Serbia)

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.


By place[edit]

Roman Empire[edit]

By topic[edit]


  • August 30Pope Sixtus II succeeds Pope Stephen I as the 24th pope.
  • Valerian's persecution of Christians begins: his edict orders bishops and priests to sacrifice according to the pagan rituals, and prohibits Christians, under penalty of death, from meeting at the tombs of their deceased.