AD 105

Year 105 was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Candidus and Iulius. The denomination 105 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.

Events

Emperor Trajan starts the second expedition against Dacia; he leaves with the Imperial Roman fleet from Brundusium.
Permanent castrum of Legio II Adiutrix at Aquincum in Pannonia.
Legio XXX Ulpia Victrix and II Traiana Fortis are created by Trajan.
The Romans conquer Kerak from the Nabateans.
Pacorus II of Parthia dies after a 27-year reign, in which he has reclaimed all of his empire. His successor Vologases III reigns until 147 AD, suppressing brief rebellions, as he battles against the Kushan and Alani.

Emperor He Di dies after a 17-year reign in which court eunuchs and the emperor's in-laws have regained influence. Empress Deng Sui places her son Shang Di on the throne, as the fifth emperor of the Chinese Eastern Han dynasty.
Last year of yongyuan era and start of yuanxing era of the Chinese Eastern Han dynasty.
A peace treaty is signed between Baekje and Silla in the Korean peninsula.

Papermaking is refined by the Chinese eunuch Cai Lun, who receives official praise from the emperor for his methods of making paper from tree bark, hemp, remnant rags and fish nets. Paper had been made in China from the 2nd century BC, but Cai Lun's paper provides a writing surface far superior to pure silk and is much less costly to produce. Bamboo and wooden slips will remain the usual materials for books and scrolls in most of the world for another 200 years, and paper will remain a Chinese secret for 500 years.
The Trajan Bridge is finished. For more than a thousand years, it is the longest arch bridge in the world to have been built, in terms of both total and span length.