A young Dominican priest. He is sympathetic toward Joan and wants her to be treated mercifully. As Joan burns at the stake, he approaches her to give her a cross. When the fire grows and threatens to harm him, Joan orders him to back away and save himself. This act of selflessness in her final moments of life leads Ladvenu to believe that Joan was inspired not by the devil but by God, and that she was ultimately redeemed in her final moments. After her death, he advocates for her image to be restored, and it is he who alerts King Charles VII to the reversal of the charges pressed against Joan. Ladvenu is concerned about the role Joan’s ignorance of the law plays in her trial—he fears she doesn’t understand the charges pressed against her, though he ultimately finds her sentence to be just.