Cesare Brandi, one of the most important personalities of twentieth-century Italy in the field of History and Art Criticism, was probably the first who strongiy emphasized the value of restoration of the works of art Working with great sensitivity and insistence, he gradually developed a restoration theory, which still remains the foundation of the evolution of this science until today as regards the restoration of the works of art, either mobile objects or architectural monuments. He also contributed considerably to the handling of town-planning problems, to the intricate issue of restoring antique ruins, to the preventive restoration and to many other relevant subjects.