Although these articles superficially resemble the Thirty-Nine Articles of the Church of England they are in fact a great deal more detailed and much less ambiguous on many matters; they also represent a more thoroughgoing and explicit Calvinism than the 39 Articles.
The reformation commenced mainly in Dublin under the auspices of George Browne (Archbishop of Dublin) during Henry's reign.
When the Church of England was reformed under King Edward VI of England, so too was the Church of Ireland.
In 1615 the Convocation of the Church of Ireland adopted 104 articles known as the Irish Articles.
James Ussher (later Archbishop of Armagh) was their main author.
The Church of Ireland, as a Reformed and Protestant Church, doth hereby re-affirm its constant witness against all those innovations in doctrine and worship whereby the Primitive faith hath been from time to time defaced or overlaid, and which at the Reformation this Church did disown and reject. The church then became the established church of Ireland, assuming possession of most church property (and so retaining a great repository of religious architecture and other items, though some were later destroyed).