San Pedro Damian, Obispo of Ostia at Kardinal, Doktor ng Simbahan, camaldolese

San Pedro Damian (c. 1007 - 1072) ay isang Italyaanong Katoliko bishop, cardinal, at Doktor ng Simbahan. Ipinanganak sa Ravenna, naging siya a Camaldolese monk at kalaunan rose to prominence as a repormaer at advisor to ilang popes. Siya ay isang tireless advocate for the reporma of the clergy at ang elimination of corruption in Simbahan. Damian kilala sa kanyang austerity, kanyang dedication to panalangin at study, at ang kanyang strong moral convictions. Siya ay made a cardinal by Papa Esteban IX at played a key role in the Gregorian repormas. Damian ay sinasamba bilang patron of repormas in the Simbahang Katoliko.