|Centuries:||11th century – 12th century – 13th century|
|Decades:||1090s 1100s 1110s – 1120s – 1130s 1140s 1150s|
|Years:||1120 1121 1122 – 1123 – 1124 1125 1126|
- First Council of the Lateran confirms Concordat of Worms and demands that priests remain celibate.
- End of the reign of Emperor Toba, emperor of Japan.
- Emperor Sutoku ascends to the throne of Japan.
- St Bartholomew's Hospital (Barts) founded in London, England.
- The Pactum Warmundi is established between the Republic of Venice and the Kingdom of Jerusalem.
- Minamoto no Yoshitomo, Japanese general (d. 1160)
- Leonardo Fibonacci, Mathematician born (d. 1209)
- August 29 — Eystein I of Norway (b. around 1088)
- Wanyan Aguda, chieftain of the Jurchen Wanyan tribe (b. 1068)
- Peter of Pappacarbone