Maria de Mattias (1805-1866) came from Vallecorsa (Frosinone), Italy. In her adolescence there she met Gaspar and Merlini, under whose guidance she came to realize that her vocation was to found a community of nuns in 1834 at Acuto: the Congregation of the Adorers of the Blood of Christ. Her motto was "Charity toward God and toward our dear neighbor."
Merlini later spoke of Maria as "a strong woman, a tireless worker…" He describes her as having a sensitive heart, open to God's grace, an energetic spirit, and a saintly character. That came, as it always does, at a personal cost. Maria's devotion to the Mother of Christ as a young woman revealed to her her vanity and pride, and moved her to eventually appreciate and perpetuate a greater vision of unselfishly helping others to realize Christ's desire to love and be loved by them, under the symbol of his precious Blood.