A Treasure to Be Shared is intended to promote a more widespread knowledge of the Apostolic Constitution Anglicanorum coetibus, promulgated by Pope Benedict XVI in 2009.The Apostolic Constitution provided for Personal Ordinariates for Anglicans entering into full communion with the Catholic Church.On the occasion of the 10th anniversary of the Apostolic Constitution, an academic symposium in the year 2019 sponsored by the Pontifical Gregorian University and the Congregation for the Doctrine of the Faith, provided historical, liturgical, canonical and ecumenical perspectives on the fruits of the Apostolic Constitution for the wider Church.The hope is that the reader will see the Personal Ordinariates of The Chair of Saint Peter in the United States and Canada, Our Lady of Walsingham in Great Britain and Our Lady of the Southern Cross in Australia as a gift to the Church, and a treasure to be shared by all.