John was born in Lodi Vecchio in 1025. In the 1060s he became a hermit at the Camaldolese monastery of Fonte Avellana. He became a disciple and the personal secretary of Peter Damian, who was the prior of Fonte Avellana. After Damian's death in 1072, John wrote a biography of Damian (1076-1082).John of Lodi, Vita Petri Damiani, ed. S. Freund, Studien zur literarischen Wirksamkeit des Petrus Damiani (Hannover, 1995), pp. 177-265 (in Latin) John later became prior of Fonte Avellana (1082-1084, and again 1100–1101). In 1104 he became Bishop of Gubbio, and held this office until his death.
