409 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
409 BC in various calendars
Gregorian calendar409 BC
CDIX BC
Ab urbe condita345
Ancient Egypt eraXXVII dynasty, 117
- PharaohDarius II of Persia, 15
Ancient Greek era92nd Olympiad, year 4
Assyrian calendar4342
Balinese saka calendarN/A
Bengali calendar−1001
Berber calendar542
Buddhist calendar136
Burmese calendar−1046
Byzantine calendar5100–5101
Chinese calendar辛未年 (Metal Goat)
2289 or 2082
    — to —
壬申年 (Water Monkey)
2290 or 2083
Coptic calendar−692 – −691
Discordian calendar758
Ethiopian calendar−416 – −415
Hebrew calendar3352–3353
Hindu calendars
 - Vikram Samvat−352 – −351
 - Shaka SamvatN/A
 - Kali Yuga2692–2693
Holocene calendar9592
Iranian calendar1030 BP – 1029 BP
Islamic calendar1062 BH – 1061 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1925
Minguo calendar2320 before ROC
民前2320年
Nanakshahi calendar−1876
Thai solar calendar134–135
Tibetan calendar阴金羊年
(female Iron-Goat)
−282 or −663 or −1435
    — to —
阳水猴年
(male Water-Monkey)
−281 or −662 or −1434

Year 409 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Cossus and Medullinus (or, less frequently, year 345 Ab urbe condita). The denomination 409 BC 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.