Chicago–Lambeth Quadrilateral

The Chicago-Lambeth Quadrilateral, frequently referred to as the Lambeth Quadrilateral or the Lambeth-Chicago Quadrilateral, is a four-point articulation of Anglican identity, often cited as encapsulating the fundamentals of the Anglican Communion's doctrine and as a reference point for ecumenical discussion with other Christian denominations. The four points are:

1. The Holy Scriptures, as containing all things necessary to salvation;
2. The creeds (specifically, the Apostles' and Nicene Creeds), as the sufficient statement of Christian faith;
3. The dominical sacraments of baptism and Holy Communion;
4. The historic episcopate, locally adapted.

The quadrilateral had its genesis in an 1870 essay by the American Episcopal priest William Reed Huntington, and was officially adopted by the bishops of the Anglican Communion in 1888. The four elements were held to establish "a basis on which approach may be by God's blessing, made toward Home Reunion", that is, with the Catholic and Eastern Orthodox churches.