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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A tapestry depicting Mother Teresa of Calcutta is seen in the facade of Saint Peter's Basilica during a mass, celebrated by Pope Francis, for her canonization in Saint Peter's Square at the Vatican, Sept. 4, 2016.

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Pope Francis leads a Mass for the conization of Mother Teresa in St. Peter's Square at the Vatican, Sept. 4, 2016.

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Nuns from the Missionaries of Charity in Kolkata, India, watch a live broadcast of the canonisation of Mother Teresa at a ceremony held in the Vatican, Sept. 4, 2016.

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Pope Francis blesses with an incense burner as he leads a Mass for the canonization of Mother Teresa of Calcutta in Saint Peter's Square at the Vatican, Sept. 4, 2016.