The Feast Day of Saint Louise de Marillac is on March 15. Saint Louise de Marillac was a French Roman Catholic and the co-founder of the Daughters of Charity. She was born in France in 1591 and devoted her life to serving the poor and marginalized. She worked alongside Saint Vincent de Paul and together they established the Daughters of Charity, a group of women who were dedicated to serving the poor and the sick. Saint Louise de Marillac was known for her deep faith and commitment to helping others. She was canonized as a saint by the Catholic Church in 1934.