The Thirty-nine Articles of Religion (commonly abbreviated as the Thirty-nine Articles or the XXXIX Articles) are the historically defining statements of doctrines and practices of the Church of England with respect to the controversies of the English Reformation. The Thirty-nine Articles form part of the Book of Common Prayer used by both the Church of England and the Episcopal Church. Several versions are available online.
When Henry VIII broke with the Roman Catholic Church and was excommunicated, he formed a new Church of England, which would be headed by the monarch (himself) rather than the pope. At this point, he needed to determine what its doctrines and practices would be in relation to the Roman Catholic Church and the new Protestant movements in continental Europe. A series of defining documents were written and replaced over a period of 30 years as the doctrinal and political situation changed from the excommunication of Henry VIII in 1533, to the excommunication of Elizabeth I in 1570. These positions began with the Ten Articles in 1536, and concluded with the finalisation of the Thirty-nine articles in 1571. The Thirty-nine articles ultimately served to define the doctrine of the Church of England as it related to Calvinist doctrine and Roman Catholic practice.
The articles went through at least five major revisions prior to their finalisation in 1571. The first attempt was the Ten Articles in 1536, which showed some slightly Protestant leanings—the result of an English desire for a political alliance with the German Lutheran princes. The next revision was the Six Articles in 1539 which swung away from all reformed positions, and then the King's Book in 1543, which re-established most of the earlier Roman Catholic doctrines. During the reign of Edward VI, Henry VIII's only son, the Forty-Two Articles were written under the direction of Archbishop Thomas Cranmer in 1552. It was in this document that Calvinist thought reached the zenith of its influence in the English Church. These articles were never put into action, due to Edward VI's death and the reversion of the English Church to Roman Catholicism under Henry VIII's elder daughter, Mary I.