Maria Faustina Kowalska, commonly known as Saint Faustina, born Helenka Kowalska (August 25, 1905, near Lodz, Poland then in the Russian Empire – Died October 5, 1938, Kraków, Poland) was a Polish nun, mystic and visionary. She is venerated in the Roman Catholic Church as a saint, and is known as the Apostle of Divine Mercy.
At age 20 she joined a convent in Warsaw and was later transferred to Plock, and then to Vilnius, where she met her confessor Michael Sopocko who supported her devotion to Divine Mercy. Faustina and Sopocko directed an artist to paint the first Divine Mercy image, based on Faustina’s reported vision of Jesus. Sopocko used the image to celebrate the first Mass on the first Sunday after Easter – which later became known as Divine Mercy Sunday.