The bond between the Catholic Church and the Coptic Orthodox Church is a reminder "to intensify our common efforts to persevere in the search for visible unity in diversity, under the guidance of the Holy Spirit," Pope Francis wrote in a letter to Coptic Orthodox Pope Tawadros II on May 10.

"Along this path, we are sustained by the powerful intercession and example of the martyrs. May we continue to advance together on our journey toward the same eucharistic table, and grow in love and reconciliation," he said.