121 CE

Roman settlement in present-day Wiesbaden, Germany, is first mentioned. Construction of the Temple of Venus and Roma begins in Rome. Emperor Hadrian fixes the border between Roman Britain and Caledonia, on a line running from the River Tyne to the Solway Firth.

In the 120s, the 2nd century.

Exploration & Expansion

  • Roman settlement in present-day Wiesbaden, Germany, is first mentioned.source
  • Emperor Hadrian fixes the border between Roman Britain and Caledonia, on a line running from the River Tyne to the Solway Firth.source

Technology & Infrastructure

  • Construction of the Temple of Venus and Roma begins in Rome.source

Climate & Environment

  • Era name changes from Yongning (2nd year) to Jianguang in the Chinese Eastern Han dynasty. (Needs clarification or deletion)source

Births

  • April 26 – Marcus Annius Verus, later Emperor Marcus Aurelius (died 180)source

Deaths

  • Deng Sui, Chinese empress of the Han dynasty (born AD 81)source
  • Cai Lun, Chinese inventor of paper and the papermaking process (born AD 50)source
  • Eleutherius and Antia, Roman Christian martyrs and saintssource