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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 378 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 378 CCCLXXVIII |
| Ab urbe condita | 1131 |
| Assyrian calendar | 5128 |
| Balinese saka calendar | 299–300 |
| Bengali calendar | −215 |
| Berber calendar | 1328 |
| Buddhist calendar | 922 |
| Burmese calendar | −260 |
| Byzantine calendar | 5886–5887 |
| Chinese calendar | 丁丑年 (Fire Ox) 3075 or 2868 — to — 戊寅年 (Earth Tiger) 3076 or 2869 |
| Coptic calendar | 94–95 |
| Discordian calendar | 1544 |
| Ethiopian calendar | 370–371 |
| Hebrew calendar | 4138–4139 |
| Hindu calendars | |
| - Vikram Samvat | 434–435 |
| - Shaka Samvat | 299–300 |
| - Kali Yuga | 3478–3479 |
| Holocene calendar | 10378 |
| Iranian calendar | 244 BP – 243 BP |
| Islamic calendar | 252 BH – 251 BH |
| Javanese calendar | 260–261 |
| Julian calendar | 378 CCCLXXVIII |
| Korean calendar | 2711 |
| Minguo calendar | 1534 before ROC 民前1534年 |
| Nanakshahi calendar | −1090 |
| Seleucid era | 689/690 AG |
| Thai solar calendar | 920–921 |
| Tibetan calendar | 阴火牛年 (female Fire-Ox) 504 or 123 or −649 — to — 阳土虎年 (male Earth-Tiger) 505 or 124 or −648 |
Year 378 (CCCLXXVIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valens and Augustus (or, less frequently, year 1131 Ab urbe condita). The denomination 378 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.