Pope Francis is set to officially canonize Mother Teresa of Calcutta as a saint in a Mass held Sunday.  

For those who cannot make it to Vatican City for the event, you can follow along over at the Vatican's YouTube page or over at Catholic TV. You can also simply scroll to the bottom of the page, where the video feed.

Teresa was born in Skopje, Macedonia in 1910, her original name Agnes Gonxha Bojaxhiu. Her work as nun focused on helping the poor in India and she earned wide renown and was given a Nobel Peace Prize in 1979. Francis, who has also focused on helping the needy, is tied to Teresa, Time Magazine points out.

"Both devoted themselves to the poor and drew attention to those whom society has cast to the margins—Teresa is known as a saint of the gutters and Francis as a pope of the slums," wrote correspondent Elizabeth Dias. "At their cores, they share a purpose in their public service and personal spirituality: to act as a channel of God’s mercy. And as Francis ushers Teresa into sainthood, her mission will continue to define his papacy."

Tens of thousands are expected to attend the canonization ceremony Sunday. Some 300,000 came to see Teresa's beatification — a step toward canonization — that was held by St. John Paul II in St. Peter's Square in 2003, just a few years after her 1997 death, according to the Associated Press. The canonization is the planned high point of the Francis' Jubilee of Mercy, a yearlong focus on allowing mercy in the church.

In order to become a saint, there must be two documented cases of miracles. For Teresa, those came when two people suffering from dramatic health issues — a woman with a stomach tumor in India and a man in a coma in Brazil with brain abscesses — credited their recoveries to prayers offered to the nun after he death, according to NPR

"A saint is someone who has lived a life of great virtue, whom we look to and admire," Bishop Barron, a frequent commentator on Catholicism, told NPR. "But if that's all we emphasize, we flatten out sanctity. The saint is also someone who's now in heaven, living in this fullness of life with God. And the miracle, to put it bluntly, is the proof of it."