Lateran II
When and where
    1139 AD at the Lateran Basilica
Crisis or controversy
    A double papal election and
ensuing schism when two rivals
      claiming to be pope divided
the church.
 
Attendees
    1000 bishops;
    Convened: Innocent II, Pope;
    St. Bernard of Clairvaux
    Ratified: Innocent II.
Decrees and resolutions
    Took measures against schism of
      antipope  Anacletis II;
    Promulgated canons of church discipline