1123 ( MCXXIII ) was a common year starting on Monday of the Julian calendar , the 1123rd year of the Common Era (CE) and Anno Domini (AD) designations, the 123rd year of the 2nd millennium , the 23rd year of the 12th century , and the 4th year of the 1120s decade. As of the start of 1123, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

Events [ change | change source ]

• 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 .

Births [ change | change source ]

• Minamoto no Yoshitomo , Japanese general (d. 1160 )
• Leonardo Fibonacci , Mathematician born (d. 1209 )

Deaths [ change | change source ]

• August 29 ? Eystein I of Norway (b. around 1088 )
• Wanyan Aguda , chieftain of the Jurchen Wanyan tribe (b. 1068 )
• Peter of Pappacarbone