In the early 1870s, when the Salesian Society was going through a happy time of expansion beyond the borders of Piedmont, thanks also to the many vocations flowing in, Don Bosco, with a group of Daughters of Mary Immaculate at Mornese who were gathered around Mary Domenica Mazzarello (1837-1881), gave life to the Institute of the Daughters of Mary Help of Christians. In a very short time it was approved by the Diocesan Ordinary and aggregated to the Salesian society, then spread throughout Italy and overseas. We publish here five documents on this women’s foundation.