Pope Francis is paying homage to Catholics who were persecuted, tortured and killed during Romania's communist regime as he beatifies seven bishop martyrs on his third and final day in the country.

Francis is to preside over the beatification ceremony Sunday in Blaj, a stronghold of the Greek-Catholic church that was outlawed during communism. The seven bishops had been arrested and imprisoned between 1950 and 1970 for adhering to their faith.

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Pilgrims hold umbrellas during a heavy rainfall before Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pope Francis is paying homage to Catholics who were persecuted, tortured and killed during Romania's communist regime as he beatifies seven bishop martyrs on his third and final day in the country.

Pilgrims walk during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

The Mass is being celebrated on the symbolic "Field of Liberty," a huge expanse east of Blaj that was the site of an important nationalist rally in 1848. A century later, communist leaders marking the anniversary at the field demanded that Greek-Catholics join the Orthodox church.

Pilgrims make their way through muddy fields during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pilgrims make their way through muddy fields during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Vatican and Romanian flags decorate the street as Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Pope Francis is travelling across Romania to visit its far-flung Catholic communities during his national tour. (AP PhotoAlexandru Dobre)

Vatican and Romanian flags decorate the street as Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Pope Francis is travelling across Romania to visit its far-flung Catholic communities during his national tour. (AP PhotoAlexandru Dobre)

Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage in Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoAlexandru Dobre)

Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage in Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoAlexandru Dobre)

Francis is expected to hold them up as models for the Romanian faithful today.

Pilgrims hold umbrellas during a heavy rainfall before Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pilgrims hold umbrellas during a heavy rainfall before Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

The Mass is being celebrated on the symbolic "Field of Liberty," a huge expanse east of Blaj that was the site of an important nationalist rally in 1848. A century later, communist leaders marking the anniversary at the field demanded that Greek-Catholics join the Orthodox church.

Pilgrims walk during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pilgrims walk during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pilgrims make their way through muddy fields during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Pilgrims make their way through muddy fields during a heavy rainfall to attend Pope Francis' Mass at the Marian shrine, in Sumuleu Ciuc, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage to Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoVadim Ghirda)

Vatican and Romanian flags decorate the street as Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Pope Francis is travelling across Romania to visit its far-flung Catholic communities during his national tour. (AP PhotoAlexandru Dobre)

Vatican and Romanian flags decorate the street as Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Pope Francis is travelling across Romania to visit its far-flung Catholic communities during his national tour. (AP PhotoAlexandru Dobre)

Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage in Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoAlexandru Dobre)

Pope Francis waves to people gathered to greet him, in Iasi, Romania, Saturday, June 1, 2019. Francis began a three-day pilgrimage in Romania on Friday that in many ways is completing the 1999 trip by St. John Paul II that marked the first-ever papal visit to a majority Orthodox country. (AP PhotoAlexandru Dobre)