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|Millennium:||1st millennium BC|
|419 BC by topic|
|Gregorian calendar||419 BC|
|Ab urbe condita||335|
|Ancient Egypt era||XXVII dynasty, 107|
|- Pharaoh||Darius II of Persia, 5|
|Ancient Greek era||90th Olympiad, year 2|
|Balinese saka calendar||N/A|
|Chinese calendar||辛酉年 (Metal Rooster)|
2278 or 2218
— to —
壬戌年 (Water Dog)
2279 or 2219
|Coptic calendar||−702 – −701|
|Ethiopian calendar||−426 – −425|
|- Vikram Samvat||−362 – −361|
|- Shaka Samvat||N/A|
|- Kali Yuga||2682–2683|
|Iranian calendar||1040 BP – 1039 BP|
|Islamic calendar||1072 BH – 1071 BH|
|Minguo calendar||2330 before ROC|
|Thai solar calendar||124–125|
−292 or −673 or −1445
— to —
−291 or −672 or −1444
Year 419 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Lanatus, Rutilus, Tricipitinus and Axilla (or, less frequently, year 335 Ab urbe condita). The denomination 419 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.
- Despite the Peace of Nicias still being in effect, Sparta's King Agis II gathers a strong army at Philus and descends upon Argos by marching at night from the north. His allied Boeotian forces fail him, but he is able to conclude a treaty with Argos.
- Euripides' play Andromache is performed.
- Sophocles' play Electra is performed. The play takes its theme from The Libation Bearers by Aeschylus.