Pieter Datheen, Latin Petrus Dathenus, English, Peter Datheen, (Cassel, Nord, c.1531 - Elbing, 17 March 1588) was a Dutch Calvinist theologian who accomplished many things for the advancement the Reformed Church liturgy. 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 (1566), though his settings were overshadowed by those of Philips Marnix van St Aldegonde. Third, he wrote the famous "Form for the Administration of Holy Baptism" with its very orthodox emphasis on the Covenant of Grace containing two parts. Fourth, he wrote the equally famous "Form for the Administration of the Lord's Supper" still used by orthodox Reformed churches today. Fifth, he was President of the Convent of Wesel in 1568, which expressed hope for the Reformed Churches to be free from the awful persecution of Spanish Roman Catholics, and more significantly President of the 1578 Synod of Dordt. Sixth, at this latter Synod he helped write, edit, and approve the long-revered Church Order (more famously known as the 1618-1619 Church Order of Dordt) with its 84 articles. Seventh, he developed the liturgy (order of worship) used by orthodox Dutch and American Reformed Churches with the singing, alms, prayer, and preaching at the required places. Eighth and finally, during Roman Catholic Spain's very intense persecution of the Lowlands region, resulting in the deaths of 100,000 - 200,000 Reformed Christians, Datheen was a field preacher carrying his pulpit on his back and then orating to crowds of 15,000 in a blunt eloquence that was intense and captivating.
In his theological-political writings Datheen displays the typically optimistic view of early Calvinist writers in the Netherlands regarding the state, although his very strong views on making sure to avoid all compromise with Roman Catholic guided countries, like Spain, put him at great odds with Prince William the Silent (of Orange) and led to Datheen's multiple political ostracizations from his fatherland.
Peter Datheen married a former Roman Catholic nun, Benedicta. Together they had one daughter, Christiana.
Recent research based on stylometry mentioned him as a possible author of the text of the Dutch national anthem Wilhelmus. Dutch and Flemish researchers (Meertens Institute, Utrecht University and University of Antwerp) discovered by chance a striking number of similarities between his style and the style of the national anthem.
- Robert Weeda Itinéraires du Psautier huguenot à la Renaissance 2009 "Marnix van St Aldegonde La concurrence dont souffraient les « Psalmen Davids » de Datheen netait pas uniquement le ... La première véritable alternative au recueil de Datheen venait de la part d'un homme politique : Philips Marnix van St Aldegonde"
- "Peter Datheen: Father of Reformed Liturgy (4) | Standard Bearer". sb.rfpa.org. Retrieved 2016-03-27.
- Jonathan Neil Gerstner The thousand generation covenant: Dutch Reformed covenant theology 1991 Page 55 "Petrus Datheen who most likely wrote the questions in the form preserved is the logical final court of appeal for ... Datheen is very typical of the early Reformed in the Netherlands in having an extremely optimistic view of the state ..."
- "Peter Datheen: Father of Reformed Liturgy (3) | Standard Bearer". sb.rfpa.org. Retrieved 2016-03-27.
- "'Schrijver Wilhelmus is te ontdekken met computeralgoritme'" (in Dutch). Retrieved 2016-08-13.
- "Toevallig op Petrus Datheen stuiten" (in Dutch). 2016-05-11. Retrieved 2016-08-13.
- "Louis Peter Grijp-lezing online" (in Dutch). 2016-05-22. Retrieved 2016-08-13.