Guido de Summa

Guido de Summa (* in the 11th or 12th century in Milan, † 1151 ) was an Italian cardinal.

He was born in Milan and was raised in Damaso on 17 December 1143 Celestine II to Cardinal Priest of S. Lorenzo. On September 23, 1149, he was named Pope Eugene III. Cardinal Bishop of Ostia. In May 1151 he attempted a dispute between the Bishop of Piacenza and canons of the collegiate church of S. Antonio at Piacenza to settle, but without success. The same year he died.