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Millennium: 1st millennium
343 in various calendars
Gregorian calendar 343
Ab urbe condita 1096
Assyrian calendar 5093
Balinese saka calendar 264–265
Bengali calendar −250
Berber calendar 1293
Buddhist calendar 887
Burmese calendar −295
Byzantine calendar 5851–5852
Chinese calendar 壬寅(Water Tiger)
3039 or 2979
    — to —
癸卯年 (Water Rabbit)
3040 or 2980
Coptic calendar 59–60
Discordian calendar 1509
Ethiopian calendar 335–336
Hebrew calendar 4103–4104
Hindu calendars
 - Vikram Samvat 399–400
 - Shaka Samvat 264–265
 - Kali Yuga 3443–3444
Holocene calendar 10343
Iranian calendar 279 BP – 278 BP
Islamic calendar 288 BH – 287 BH
Javanese calendar 224–225
Julian calendar 343
Korean calendar 2676
Minguo calendar 1569 before ROC
Nanakshahi calendar −1125
Seleucid era 654/655 AG
Thai solar calendar 885–886
Tibetan calendar 阳水虎年
(male Water-Tiger)
469 or 88 or −684
    — to —
(female Water-Rabbit)
470 or 89 or −683

Year 343 (CCCXLIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Memmius and Romulus (or, less frequently, year 1096 Ab urbe condita). The denomination 343 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.


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  • Pope Julius I tries to unite the Western bishops against Arianism by convoking the Council of Sardica (later Sofia), which acknowledges the pope's supreme authority and grants him the right to judge cases involving the legal possession of episcopal sees, but only Western and Egyptian bishops attend, and Arianism remains strong.