This biography has the term “theological” as a subtitle to strongly indicate the vocation to which the author has dedicated his life. Ambrosian bishops and scholars, characters who have made the history of the twentieth century, are accompanied by capital figures in the history of Christianity: Ambrogio, Tommaso, Bernardo, Anselmo, together with authors of global importance such as Chenu, Leclercq, Southern, Newman. Exciting encounters, long relationships and friendships. An engaging and significant volume also for medieval studies, for the knowledge of the Ambrosian church and for the cultural environment of theology.