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|330 by topic|
|Ab urbe condita||1083|
|Balinese saka calendar||251–252|
|Chinese calendar||己丑年 (Earth Ox)|
3026 or 2966
— to —
庚寅年 (Metal Tiger)
3027 or 2967
|- Vikram Samvat||386–387|
|- Shaka Samvat||251–252|
|- Kali Yuga||3430–3431|
|Iranian calendar||292 BP – 291 BP|
|Islamic calendar||301 BH – 300 BH|
|Minguo calendar||1582 before ROC|
|Seleucid era||641/642 AG|
|Thai solar calendar||872–873|
456 or 75 or −697
— to —
457 or 76 or −696
|Wikimedia Commons has media related to 330.|
Year 330 (CCCXXX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gallicanus and Tullianus (or, less frequently, year 1083 Ab urbe condita). The denomination 330 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.
- May 11 – Emperor Constantine the Great dedicates Constantinople, or Nova Roma (modern Istanbul), and moves the capitol of the Roman Empire there from Rome. He has spent 4 years building the city on the site of ancient Byzantium, having chosen the site for its strategic location (a seaport with easy access to Anatolia and the Danube). This forms the Roman splinter empire, known as the Byzantine Empire.
- The Goths devastate the city of Tanais in the Don River delta.
- Ezana, king of Axum, extends his area of control to the west. He defeats the Nobates, and destroys the kingdom of Meroë.
- Frumentius is the first bishop of Ethiopia (approximate date).
- Eustathius, Patriarch of Antioch, is banished to Trajanopolis.
- The Bible is translated into the Gothic language by Wulfila.
- Pagan temples begin to be progressively abandoned, destroyed or left to fall into disrepair, save those that are transformed into churches.
- Basil the Great, bishop of Caesarea Mazaca (d. 379)
- Macrina the Younger, Christian nun and saint (d. 379)
- Moses the Black, Christian monk and priest (d. 405)
- Victricius, missionary and bishop of Rouen (approximate date)
- May 15 – Achillius of Larissa, Greek saint
- June 30 – Tiridates III, king of Arsacid Armenia, Armenian Orthodox priest and saint
- August 18 – Helena, Empress of the Roman Empire and Roman Catholic religious sister and saint (b. 250)
- August 28 – Saint Vicinius of Sarsina, first bishop of Sarsina