Called by Alexander III because of the schism of the anipope Callistus III. It dealt mainly with the issue of papal election and declared that a two-thirds majority by the college of cardinals was required.
|F. Donald Logan, A History of the Church in the Middle Ages. London & New York: Routledge, 2002. Pbk. ISBN: 0415132894. pp.135-136. [Sign-up to Perlego and access book instantly]|
|Norman P Tanner, The Councils of the Church: A Short History. The Crossroad Publishing Company, 2001. Pbk. ISBN: 0824519043. pp.144.|