On April 10 and 11, Pope Francis, Archbishop Justin Welby, and Rev. John Chalmers (Church of Scotland) led a retreat for the political and religious leaders of South Sudan (10 Apr. 2019). Photo credit: Servizio Fotografico - Vatican Media

On April 10 and 11, Pope Francis, Archbishop Justin Welby, and Rev. John Chalmers (Church of Scotland) led a retreat for the political and religious leaders of South Sudan (10 Apr. 2019). Photo credit: Servizio Fotografico - Vatican Media

The Revd Dr Will Adam with the Archbishop of Canterbury, Justin Welby (2019). Photo credit: Lambeth Palace

The choir of Hereford Cathedral was invited to join the choir of the Sistine Chapel on the steps of St Peter's, Rome, to sing for the two-hour St Peter's mass on 29 June 2018. The Dean of Hereford Cathedral, the Very Revd Michael Tavinor said: 'We felt today that we were playing our small part for the cause of Christian unity. Those choirboys will be telling their grandchildren about the day they came to Rome and sang for the Pope. It will always be with them' (29 June 2018). Photo credit: Hereford Cathedral

Archbishop Justin Welby addresses the General Assembly of the Conference of European Churches in Novi Sad, Serbia (2 June 2018). Photo credit: Albin Hillert/CEC

A service to mark the 500th anniversary of the Reformation was held at Westminster Abbey, London. From left: the LWF General Secretary Rev. Dr Martin Junge, the Reverend Isabelle Hamley, the Archbishop of Canterbury Justin Welby, the PCPCU Secretary Bishop Dr. Brian Farrell, the Dean of Westminster Rev. Dr John Hall (31 Oct. 2017). Photo credit: Andrew Dunsmore/Westminster Abbey

Pope Francis greets Archbishop of Canterbury Justin Welby during a private audience at the Vatican Oct. 27, 2017 (27 Oct. 2017). Photo credit: CNS/L'Osservatore Romano

Pope Francis greets Archbishop of Canterbury Justin Welby during a private audience at the Vatican Oct. 27, 2017 (27 Oct. 2017). Photo credit: CNS/L'Osservatore Romano

Archbishop Bernard Ntahoturi is installed as Director of the Anglican Centre in Rome (26 Oct. 2017). Photo credit: ACR

The service concluded with a solemn blessing given together by the Archbishop of Canterbury, Archbishop Bernard and Archbishop Paul Gallagher (26 Oct. 2017). Photo credit: ACR

Archbishop Justin Welby preaches at Ecumenical Vespers at the Oratory of San Francesco Saverio 'del Caravita' (6 Oct. 2016). Photo credit: ACR

Archbishop of Canterbury, Justin Welby, met with IARCCUM at the offices of the PCPCU on October 6, 2016 immediately after his visit with Pope Francis (6 Oct. 2016). Photo credit: ACO

Pope Francis gave Archbishop Justin Welby a replica of the Crozier of St. Gregory the Great (5 Oct. 2016)

Archbishop Justin Welby and Pope Francis stand together in front of the congregation at the Vespers at San Gregorio al Celio (5 Oct. 2016)

Archbishop Justin Welby commissions Archbishop Donald Bolen, co-chair of IARCCUM, at the Vespers in San Gregorio al Celio (5 Oct. 2016)

Archbishop Justin Welby speaking at the symposium at the Gregorian University (5 Oct. 2016)

Archbishop Justin Welby commissions Archbishop Donald Bolen, co-chair of IARCCUM, at the Vespers in San Gregorio al Celio (5 Oct. 2016)

Pope Francis and Archbishop Justin Welby entering San Gregorio al Celio for Vespers with the IARCCUM bishops (5 Oct. 2016)

Pope Francis and Archbishop Justin Welby stop to pray at the throne of St. Gregory during the recessional after Vespers at San Gregorio al Celio (5 Oct. 2016). Photo credit: Rev. Amanda Currie

Pope Francis and Archbishop Justin Welby share a word and embrace during the Vespers at San Gregorio al Celio (5 Oct. 2016). Photo credit: L'Osservatore Romano

Archbishop Justin Welby greeting Bishop John Bauerschmidt during the ecumenical vespers at San Gregorio al Celio (5 Oct. 2016). Photo credit: L'Osservatore Romano

Archbishop Justin Welby and Pope Francis entering San Gregorio al Celio for the ecumenical vespers (5 Oct. 2016). Photo credit: Bishop John Bauerschmidt

Pope Francis greeting Bishop John Bauerschmidt during the ecumenical vespers at San Gregorio al Celio (5 Oct. 2016)

Final Benediction at the Ecumenical Vespers at San Gregorio al Celio (5 Oct. 2016). Photo credit: CNS/Paul Haring