Faustina Kowalska, a Polish nun whose apparitions of Jesus inspired the Catholic devotion to the Divine Mercy, was canonized by Pope John Paul II.

Maria Faustyna Kowalska of the Blessed Sacrament, OLM was a Polish Catholic religious sister and mystic. Faustyna, popularly spelled "Faustina", had apparitions of Jesus Christ which inspired the Catholic devotion to the Divine Mercy, therefore she is sometimes called the "secretary" of Divine Mercy.

A number of people have claimed to have had visions of Jesus Christ and personal conversations with him. Some people make similar claims regarding his mother, Mary. Discussions about the authenticity of these visions have often invited controversy. The Catholic Church endorses a fraction of these claims, and various visionaries it accepts have achieved beatification, or even sainthood.

Catholic devotions are particular customs, rituals, and practices of worship of God or honour of the saints which are in addition to the liturgy of the Catholic Church, described as "expressions of love and fidelity that arise from the intersection of one's own faith, culture and the Gospel of Jesus Christ". Devotions are not considered part of liturgical worship, even if they are performed in a church or led by a priest, but rather they are paraliturgical. The Congregation for Divine Worship at the Vatican publishes a Directory on Popular Piety and the Liturgy.

The Divine Mercy is a Catholic devotion to the mercy of God associated with the reported apparitions of Jesus to Faustina Kowalska.

Pope John Paul II was head of the Catholic Church and sovereign of the Vatican City State from 16 October 1978 until his death in 2005. He was the first non-Italian pope since Adrian VI in the 16th century, as well as the third-longest-serving pope in history, after Pius IX and St. Peter.