Years: 117 118 119 120 - 121 - 122 123 124 125

Decades: 90s 100s 110s - 120s - 130s 140s 150s

Centuries: 1st century - 2nd century - 3rd century 121 (number)

Events

• Era name changes from Yongning (2nd year) to Jianguang in the Chinese Eastern Han Dynasty.
• Roman settlement in present-day Wiesbaden, Germany is first mentioned.
• Roman emperor Hadrian fixes the border between Roman Britain and Caledonia on a line running from the River Tyne to the Solway Firth.

Births

• April 26 - Marcus Annius Verus, later the Roman Emperor Marcus Aurelius

Deaths

• Cai Lun, inventor of paper