The papal election of 1153 followed the death of Pope Eugene III and resulted in the election of Pope Anastasius IV.
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Election of Anastasius IV
Pope Eugenius III died on July 8, 1153, at Tivoli. On July 12 the cardinals elected as his successor cardinal Corrado Demetri della Suburra, bishop of Sabina and dean of the College of Cardinals, who was 80 years old. He took the name Anastasius IV and was crowned on the same day, probably in Rome.
Cardinal-electors
There were 35 cardinals in the Sacred College of Cardinals in July 1153, but it seems that no more than 30 (perhaps even less) participated in the election:
Six electors were created by Pope Innocent II, five by Pope Celestine II, six by Pope Lucius II, twelve by Pope Eugenius III and one by Pope Paschalis II.
References
Papal election, 1153 Wikipedia(Text) CC BY-SA