After landing in South Sudan in the afternoon of Feb. 3, Pope Francis was joined by Archbishop Welby and Right Rev. Greenshields.
The three met Mayardit at the president’s residence before Pope Francis and Mayardit separated for a private encounter.
The pope’s first speech in the country will be to authorities, members of the diplomatic corps, and representatives of civil society.
On Feb. 4 he will meet bishops, priests, and consecrated men and women in St. Theresa Cathedral, the seat of the archbishop of Juba.
Bishops from the country of Sudan, from whom South Sudan separated in 2011, will also be present at the meeting.
There are seven Catholic dioceses in South Sudan, with the number of Catholics estimated to be 7.2 million, according to the Vatican.