The Confession of Faith, popularly known as the Belgic Confession, is a confession to which many Reformed churches subscribe as a doctrinal standard. The Confession forms part of the Three Forms of Unity,[1] which are the official subordinate standards of the Dutch Reformed Church.[2]: 187 [3] The confession's chief author was Guido de Brès, a Walloon Reformed pastor,[3] active in the Low Countries, who died a martyr to the faith in 1567, during the Dutch Reformation.[2]: 185 The name Belgic Confession follows the 17th-century Latin Confessio Belgica. Belgica referred to the whole of the Low Countries, both north and south, which today is divided into the Netherlands and Belgium.