The Pope asked a priest to read his message to the athletes and then greeted them one by one.
The campaign joins the relaunch of the diocesan commission to promote the cause of canonization for the queen.
The Pope sat on stage in front of the crowd throughout the one-hour public audience, which included a circus performance.
The people who met Pope Francis on Tuesday were victims of Brother Gabriel Girard, a member of the Montfort Brothers of St. Gabriel, who abused them in the 1960s and 1970s in France.
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The Holy Father joined the meeting once the meditation began and when it was over they had an extensive conversation for about two hours.