Guido de Summa

Guido de Summa (died 1151) was an Italian Cardinal.

He was born in Milan. Probably he was already a Cardinal-Deacon under Pope Innocent II and as such, he signed papal bulls between January 12, 1142 and December 9, 1143. Certainly Pope Celestine II named him Cardinal-Priest of S. Lorenzo in Damaso in the consistory celebrated on December 17, 1143. He subscribed the papal bulls as Cardinal-Prest between December 28, 1143 and May 6, 1149 and participated in the papal election, 1144 and papal election, 1145. On September 23, 1149 Eugenius III consecrated him Bishop of Ostia; as such, he signed papal bulls from November 6, 1149 until April 14, 1150. For many years he acted as papal legate in Lombardy. He is attested for the last time in the document issued in Ferentino on May 10, 1151.

Bibliography

• Johannes M. Brixius, Die Mitglieder des Kardinalkollegiums von 1130-1181, Berlin 1912, p. 49-50 no. 4