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|504 by topic|
|Ab urbe condita||1257|
|Balinese saka calendar||425–426|
|Chinese calendar||癸未年 (Water Goat)|
3200 or 3140
— to —
甲申年 (Wood Monkey)
3201 or 3141
|- Vikram Samvat||560–561|
|- Shaka Samvat||425–426|
|- Kali Yuga||3604–3605|
|Iranian calendar||118 BP – 117 BP|
|Islamic calendar||122 BH – 121 BH|
|Minguo calendar||1408 before ROC|
|Seleucid era||815/816 AG|
|Thai solar calendar||1046–1047|
630 or 249 or −523
— to —
631 or 250 or −522
Year 504 (DIV) was a leap 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 Nicomachus without colleague (or, less frequently, year 1257 Ab urbe condita). The denomination 504 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.
- War with Sassanid Persia: Emperor Anastasius I gains the upper hand in Armenia, with the renewed investment of Amida.
- King Kavadh I hands over the fortress-city of Amida, and agrees to an armistice with the Byzantine Empire.
- King Theodoric the Great defeats the Gepids, and drives them out of their homeland (Pannonia).
- The Ostrogoths sack Belgrade, on the Danube and Sava rivers (modern Serbia).
- A major expansion of Copán's ceremonial center, the Acropolis complex, is undertaken by B'alam Nehn (Waterlily Jaguar), the seventh ruler (ajaw) of the southeastern Maya city (approximate date).
- Theodoric the Great builds the Basilica of Sant'Apollinare Nuovo, originally dedicated to Christ the Redeemer.
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