Petrus Dathenus [SEP] native language
Pieter Datheen
Pieter Datheen, Latin Petrus Dathenus, English, Peter Datheen, (Cassel, Nord, c.1531 - Elbing, 17 March 1588) was a Dutch Calvinist theologian, the 16th century reformer of The Netherlands, who accomplished many things for the advancement the Reformed Church liturgy and ecclesiastical polity. 
First, he translated the Heidelberg Catechism into Dutch. Second, using the singing work of John Calvin,Theodore Beza, Peter Marot, and Louis Bourgeois, Datheen set the Psalms and psalter to verse and tune in Dutch
government, also called the "Achttienmannen". Hembyse became the chairman of this council with the title of First "Schepen". Hembyse had the support of the noted Calvinist clergymen Petrus Dathenus and Herman Moded who helped him keep control of the Calvinist "mob". He armed the citizens of Ghent and hired Scottish mercenaries. This gave him the military means to conquer a number of other Flemish cities where similar Calvinist city republics, governed by councils of "Achttienmannen" were formed.
The Ghent Calvinists were not interested in