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Guibert of Ravenna
http://www.newadvent.org/cathen/07063a.htmAn antipope, known as Clement III, 1080 (1084) to 1100; born at Parma about 1025; died at Cività Castellana, 8 Sept., 1100.
Submitted in section: Religion & Spirituality: Christianity: Denominations: Catholicism: Reference: Catholic Encyclopedia: G: Guibert of Ravenna