She was born Giuseppina De Micheli in Milan on 11 September 1890. She had been aware from an early age of the Holy Face of Jesus devotion, which had been started almost a century earlier by a French Carmelite nun, Sister Marie of St Peter, of Tours, France. Giuseppina joined the Congregation of the Daughters of the Immaculate Conception in October 1913, and took the name Sister Maria Pierina on 16 May 1914, when she made her vows. She was then sent to the motherhouse in Buenos Aires, Argentina, where she remained until 1921. While there, her attachment to the Holy Face devotion grew stronger. After her return to Milan she was eventually elected as the mother superior of her house and began to spread the devotion.
Visions
On the first Friday in Lent 1936 she reported a vision of Christ in which Jesus appeared to her and said: “I will that My Face, which reflects the intimate pains of My Spirit, the suffering and the love of My Heart, be more honored. He who meditates upon Me, consoles Me”. Further reported visions of Jesus and Mary urged Sister Maria Pierina to make a medal with the Holy Face of Jesus. After some effort, she managed to obtain permission to reproduce the photograph of the Shroud of Turin and authorization from the Curia in Milan to proceed with the medal in 1940. This became known as the Holy Face Medal. On one side the medal bears a replica of the Holy Shroud of Turin and an inscription based on Psalm 66:2: "Illumina, Domine, vultum tuum super nos", i.e. "May, O Lord, the light of Thy countenance shine upon us". On the other side of the medal, there is an image of a radiant Sacred Host, the monogram of the Holy Name, and the inscription "Mane nobiscum, Domine" i.e. "Stay with us, O Lord".
Approval of the Holy Face medal
The first medal of the Holy Face was offered to Pope Pius XII who approved the devotion and the medal. She had also reported that Jesus wanted a special Feast on the day beforeAsh Wednesday in honor of His Holy Face, to be preceded by a Novena of prayers. In 1958, Pope Pius XII declared the Feast of the Holy Face of Jesus as Shrove Tuesday for all Roman Catholics.
Final years
In 1941 she wrote in her diary: "I feel a deep longing to live always united to Jesus, to love Him intensely because my death can only be a transport of love with my Spouse, Jesus." Sister Maria Pierina died on 26 July 1945 in Milan. Her remains are located at the Holy Spirit Institute in Rome.