The period from 1565-1640 was a period of Reformed scholasticism and the early orthodox codification of theological systems. Several factors account for the growth of orthodoxy or scholasticism. In response to the defining of the faith in the Catholic Church at the Council of Trent(1545-1563), there arose a similar need to more carefully define the Reformed faith. This need resulted in such documents as the Heidelberg Catechism(1563). The Reformed Church also had the need to respond to controversies, as in the Synod of Dort as a response to Arminianism in 1618-19.