Mercedes Prat was born on March 6, 1880, in Barcelona, Spain. From her childhood she gave herself completely to God. She displayed a great love for her neighbour and tried to foster this kind of love in others. She entered the noviciate of the Society of St Teresa of Jesus in 1904, in Tortosa, and making her profession in 1907. She was a religious according to the heart of God: prudent and truthful, calm and gentle, but firm in character. God was her one love. In 1920 she was assigned to Barcelona. From there the path to martyrdom began on July 9, 1936, when the community was forced to give up its school and flee. On July 23, because she was a religous, Sr Mercedes was arrested and shot; she died on July 24.