John Mills

as Monsignor Blaise Meredith

Stéphane Audran

as Contess Anne Di Sanctis

Jason Miller

as Dr. Aldo Meyer

Paola Pitagora

as Nina Sanduzzi

Leigh Lawson

as Giacomo Nerone / James Black

Timothy West

as Father Anselmo

Patrick Mower

as 'Il Lupo'

Raf Vallone

as Bishop Aurelio

Romolo Valli

as Cardinal Marotta

Jack Hedley

as Doctor

Daniel Massey

as Nicholas Black