255

This article is about the year 255. For the number, see 255 (number).

Year 255 (CCLV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known in Rome as the Year of the Consulship of Valerianus and Gallienus (or, less frequently, year 1008 Ab urbe condita). The denomination 255 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.

Millennium:	1st millennium
Centuries:	2nd century 3rd century 4th century
Decades:	230s 240s 250s 260s 270s
Years:	252 253 254 255 256 257 258

255 in various calendars

Gregorian calendar	255 CCLV
Ab urbe condita	1008
Assyrian calendar	5005
Balinese saka calendar	176–177
Bengali calendar	−338
Berber calendar	1205
Buddhist calendar	799
Burmese calendar	−383
Byzantine calendar	5763–5764
Chinese calendar	甲戌年 (Wood Dog) 2952 or 2745     — to — 乙亥年 (Wood Pig) 2953 or 2746
Coptic calendar	−29 – −28
Discordian calendar	1421
Ethiopian calendar	247–248
Hebrew calendar	4015–4016
Hindu calendars
- Vikram Samvat	311–312
- Shaka Samvat	176–177
- Kali Yuga	3355–3356
Holocene calendar	10255
Iranian calendar	367 BP – 366 BP
Islamic calendar	378 BH – 377 BH
Javanese calendar	134–135
Julian calendar	255 CCLV
Korean calendar	2588
Minguo calendar	1657 before ROC 民前1657年
Nanakshahi calendar	−1213
Seleucid era	566/567 AG
Thai solar calendar	797–798
Tibetan calendar	阳木狗年 (male Wood-Dog) 381 or 0 or −772     — to — 阴木猪年 (female Wood-Pig) 382 or 1 or −771

Events

By place

China

• Sima Shi quells Guanqiu Jian and Wen Qin's rebellion.
• March 23 – Sima Shi passes away.
• Sima Zhao, Sima Shi's younger brother, inherits his brother's authority.

By topic

Science

• Ma Jun, Chinese mechanical engineer from Cao Wei, invents the south-pointing chariot, a path-finding directional compass vehicle that uses a differential gear, not magnetics.

Births

• January 6 – Marcellus I, bishop of Rome (d. 309)
• Dorotheus of Tyre, Syrian bishop and martyr (d. 362)
• Zhang Gui, Chinese governor of the Jin Dynasty (d. 314)
• Zuo Fen, Chinese poet of the Western Jin Dynasty (d. 300)
• Saint Helena, Roman empress who was the reputed discoverer of Christ’s cross and mother of Emperor Constantine (d. 318)

Deaths

• February 23 – Guo Huai (or Boji), Chinese general
• March 16 – Guanqiu Jian, Chinese general and politician
• March 23 – Sima Shi, Chinese general and regent (b. 208)
• Fu Gu (or Lanshi), Chinese official and politician (b. 209)
• Liu Zan (or Zhengming), Chinese general (b. 183)
• Sun Luyu (or Xiaohu), Chinese princess