It was convened by Pope Innocent II in April 1139 and attended by close to a thousand clerics.
In 1135, Innocent II held a council at Pisa, which confirmed his authority and condemned Anacletus.
Anacletus's death in 1138 helped largely to solve the tension between rival factions.
King Roger II of Sicily was excommunicated[3] for maintaining what was thought to be a schismatic attitude.
The council also condemned the teachings of the Petrobrusians and the Henricians, the followers of Peter of Bruys and Henry of Lausanne.