Council of London in 1102
The Council of London, also known as the Synod of Westminster, was a Catholic church council convened by Anselm, Archbishop of Canterbury, on Michaelmas in 1102. It marked the first major council of his episcopate, as he had been prohibited from convening any during the reign of William II of England.
Source: Wikipedia — Council of London in 1102 (CC BY-SA 4.0)