The purpose of the Synod held in Dordrecht [Holland] was to settle a controversy that had arisen in the Dutch churches following the spread of Arminianism. After the death of Jacob Arminius his followers presented objections to the Belgic Confession and the teaching of John Calvin, Theodore Beza, and their followers. These objections were published in a document called The Remonstrance of 1610, and his proponents were therefore also known as Remonstrants. The opposing Calvinists, led by professor Franciscus Gomarus of the University of Leiden, became known as the Contra-Remonstrants. 

The Remonstrance and in some later writings, the Arminians published an alternative to the Calvinist doctrine of the Belgic Confession on five points of difference. They taught election on the basis of foreseen faith, a universal atonement, partial human depravity, resistible grace, and the possibility of lapse from grace. Simon Episcopius (1583–1643) was spokesman of the 13 representatives of the Remonstrants who were summoned before the Synod in 1618. (Wikipedia, the free encyclopedia)
 

The Synod rejected the Arminian belief by setting forth their doctrine on each point.  These doctrines are often called the TULIP doctrines.