Pliny the Younger is a member of the college of Augurs (103–104).
Nijmegen is renamed Ulpia Noviomagus Batavorum.
A fire breaks out in Rome.
Trajan gives the order to have the Alcántara Bridge built over the Tagus River at Alcántara (Hispania), constructed by the architect Lacer.
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).
In India, figures of Buddha replace abstract motifs on decorative items.
Chen Shi, Chinese official (d. 187)
Martial, Roman poet (b. 40)
Year 104 (CIV) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. 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.