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Year 104 (CIV) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar, the 104th Year of the Anno Domini (AD) designation, the 104th year of the 1st millennium, the 4th year of the 2nd century, and the 5th year of the 100s decade. At the time, it was known as the Year of the Consulship of Suburanus and Marcellus (or, less frequently, year 857 Ab urbe condita). The denomination 104 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.
|Ab urbe condita||857|
|Balinese saka calendar||25–26|
|Chinese calendar||癸卯年 (Water Rabbit)|
2800 or 2740
— to —
甲辰年 (Wood Dragon)
2801 or 2741
|Coptic calendar||−180 – −179|
|- Vikram Samvat||160–161|
|- Shaka Samvat||25–26|
|- Kali Yuga||3204–3205|
|Iranian calendar||518 BP – 517 BP|
|Islamic calendar||534 BH – 533 BH|
|Minguo calendar||1808 before ROC|
|Seleucid era||415/416 AG|
|Thai solar calendar||646–647|
230 or −151 or −923
— to —
231 or −150 or −922
- Pliny the Younger continues as a member of the College of Augurs (103–104).
- Nijmegen is renamed Ulpia Noviomagus Batavorum.
- A fire breaks out in Rome.[unreliable source?]
- Trajan gives the order to have the Alcántara Bridge, constructed by the architect Lacer, built over the Tagus River at Alcántara (Hispania).
- Apollodorus of Damascus builds a stone bridge over the Danube more than 1,000 meters (3,300 feet) long, almost 20 meters (66 feet) high and 15 meters (49 feet) wide. The bridge connects what is now Serbia with Romania (at the time known as Dacia).
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- Gordon, Richard L.; Petridou, Georgia; Rüpke, Jörg (2017). Beyond Priesthood: Religious Entrepreneurs and Innovators in the Roman Empire. Walter de Gruyter GmbH & Co KG. p. 34. ISBN 978-3-11-044818-4.
- Dando-Collins, Stephen (2010). The Great Fire of Rome: The Fall of the Emperor Nero and His City. Hachette Books. p. 17. ISBN 978-0-306-81933-9.