This history celebrates the Catholic League, an ecumenical society founded in 1913 to promote the unity of Christians and to encourage the journey of all towards the visible unity of the whole Church.

It was founded by Anglicans who believed passionately that the future of their Church lay in the reunion of all Christians in a common Catholic and Apostolic faith in restored full communion with the Successor of Peter in the see of Rome. Today, its members include Anglicans, Roman Catholics, Orthodox, Eastern Catholic, Free Church Christians who work together in pursuit of the League's four objectives:

- The promotion of fellowship among those who profess the Catholic faith;
- The union of all Christians with the Apostolic See of Rome;
- The spread of the Catholic faith;
- The deepening of the spiritual life.