Pope Francis declared Mother Teresa a saint in highlight of his Holy Year of Mercy on Sunday during a canonization ceremony in front of tens of thousands of people at Peter's Square.
Mother Teresa Becomes 'Saint Teresa of Calcutta'

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The relics of Mother Teresa are carried by nuns prior to the start of a mass celebrated by Pope Francis where she will be canonized in St. Peter's Square, at the Vatican, Sept. 4, 2016.

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Pope Francis kisses the altar ahead of a Canonization Mass for Mother Teresa, in St. Peter's Square at the Vatican, Sept. 4, 2016. Francis has declared Mother Teresa a saint, honoring the tiny nun who cared for the world's most destitute as an icon for a Catholic Church that goes to the peripheries to find poor, wounded souls.

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A priest kisses the relics of Mother Teresa prior to the start of a Mass celebrated by Pope Francis where she will be canonized in St. Peter's Square, at the Vatican, Sept. 4, 2016.

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Faithful attend a Mass lead by Pope Francis in Saint Peter's Square at the Vatican for the canonization of Mother Teresa, Sept. 4, 2016.