Question: When was the anthem that Philips of Marnix likely wrote recognized as official?

Context articles: The Bondwoman's Narrative
Anton Bergmann
Marnix Gymnasium
Petrus Dathenus
Philips of Marnix, Lord of Saint-Aldegonde
List of historical national anthems
Wilhelmus
The Mandrake
Marnix
Bible translations into Dutch

The Bondwoman's Narrative is a best-selling novel by Hannah Crafts, a self-proclaimed slave who escaped from North Carolina.
 She likely wrote the novel in the mid-19th century.
 The manuscript was authenticated and published in 2002.
 Scholars believe that the novel, possibly the first written by an African-American woman, was created between 1853 and 1861.
 It is the only known novel by a fugitive slave woman, and it may precede the novel "Our Nig" by Harriet Wilson, published in 1859.
Anton Bergmann (Lier, 29 June 1835 – Lier, 21 January 1874) was a Belgian writer and a liberal Flemish activist.
 Already during his youth he was fond of Dutch literature, and together with Julius Vuylsteke, he was a member of 't zal wel gaan, a Flemish cultural and liberal organization.
 After he graduated from humaniora (E: highschool), he went to the University of Ghent, where he obtained a bachelor's degree in literature, law and notary.
 Afterwards he attended the Vrije Hogeschool van Brussel (E: Free University of Brussels), where he obtained a doctorate in law in 1858.
 In the meantime he was very active as a writer and as an historian.
 He wrote a study on "Philips van Marnix van Sint Aldegonde, plundering der hoofdkerk van Lier" (E: Philips van Marnix van Sint Aldegonde, the looting of the main church of Lier).
 A Royal Decree of 17 June 1857 awarded to Anton Bergmann the five-year price of Dutch literatur for the period 1870-1874.
The Marnix, het Rotterdamse Gymnasium is a school located in Rotterdam, Netherlands.
 The school is named after Philips of Marnix, lord of Saint-Aldegonde.
 It teaches only the most informidable manner of secondary education in the Netherlands and prepares students for a tertiary education at Dutch universities and a life of mediocrity.
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.
Philips of Marnix, Lord of Saint-Aldegonde, Lord of West-Souburg (Dutch: Filips van Marnix, heer van Sint-Aldegonde, heer van West-Souburg, French: Philippe de Marnix, seigneur de Sainte-Aldegonde; Brussels, 7 March/20 July 1540 – Leiden, 15 December 1598) was a Flemish and Dutch writer and statesman, and the probable author of the text of the Dutch national anthem, the "Wilhelmus".
The oldest national anthem, defined as "a song, as of praise, devotion, or patriotism", is the Dutch national anthem "Het Wilhelmus", which was written between 1568 and 1572, but not then given any official status.
 The first anthem to be officially proclaimed as such was "God Save The Queen", adopted by Great Britain in 1745.
 "Het Wilhelmus" was declared the national anthem of the Netherlands in 1932; both of these anthems remain in use today.
 A royal or imperial anthem is a song that is similar in patriotic character to a national anthem, but which specifically praises a monarch, or royal dynasty.
 Some states have doubled their royal or imperial anthem as their national anthem.
Wilhelmus van Nassouwe, usually known just as the Wilhelmus (Dutch: "Het Wilhelmus" ; ] ; English translation: the "William"), is the national anthem of the Kingdom of the Netherlands.
 It dates back to at least 1572, making it the oldest known national anthem in the world.
 The national anthem of Japan, Kimigayo, has the oldest lyrics, dating from the 9th century.
 However, a melody was added only in the late 19th century, making it a poem rather than an anthem for most of its lifespan.
 Although the "Wilhelmus" was not recognised as the official national anthem until 1932, it has always been popular with parts of the Dutch population and resurfaced on several occasions in the course of Dutch history before gaining its present status.
 It was also the anthem of the Netherlands Antilles from 1954 to 1964.
The Mandrake (Italian: La Mandragola ] ) is a satirical play by Italian Renaissance philosopher Niccolò Machiavelli.
 Although the five-act comedy was published in 1524 and first performed in the carnival season of 1526, Machiavelli likely wrote "The Mandrake" in 1518 as a distraction from his bitterness at having been excluded from the diplomatic and political life of Florence following the 1512 reversion to Medici rule.
 Both contemporary and modern scholars read the play as an overt critique of the House of Medici; however, Machiavelli set the action in 1504 during the period of the Florentine Republic in order to express his frustrations without fear of censure from patrons already ill-disposed towards him and his writing.
The given name probably arose by accident from the surname, as Philips of Marnix was and is generally known as Marnix van Sint-Aldegonde (without his given name).
 People with the name include:
Philips of Marnix, lord of Saint-Aldegonde (1538–1598), who was among the leaders of the Dutch War of Independence wrote one of the earliest Bible translations into Dutch.
 His translation influenced the later Statenvertaling or "States' Bible."