1123

Events

• First Council of the Lateran confirms Concordat of Worms and demands that priests remain celibate
• End of the reign of Emperor Toba of Japan.
• Emperor Sutoku ascends to the throne of Japan

Births

Deaths

• August - Wanyan Aguda, first emperor of the Jurchen Jin Dynasty.
• December 17 - Omar Khayyam, Persian poet, astronomer, mathematician and philosopher. (1123 is the most supported date of his death. It has also been dated as 1132 and 1048)