The pontiff began with an early visit to Bozzolo, a village in the country's north where Father Primo Mazzolari died in 1959.
"Father Mazzolari was convinced that the destinies of the world play out at the margins," said Francis, who has often made efforts to reach the faithful who live on society's edge.
The pope also praised him as a "priest who was poor and not a poor priest, which is not the same thing."
Some of his books were also banned, but in 1959, three months before his death, he met with Pope John XXIII, who welcomed him as a priest inspired by the Holy Spirit.
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Pope Francis travelled later today to Barbiana, about an hour's drive northeast of Florence in central Italy, to visit the grave of Father Lorenzo Milani.
Shortly after arriving in the village in 1954, Milani opened a school for working-class children while advocating the use of innovative teaching methods.
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