Both men had in their day been instrumental to winning the independence (de facto, if not yet de jure) that the Low Countries were already enjoying: laandsadvocaat van Oldenbarnevelt as the commanding political personality holding together the potentially fractious provinces in the 1580s and 1590s; stadtholder Maurice as the great general* of those provinces, whose sword-arm in the 1590s and 1600s more or less staked out the borders of the present-day Netherlands.
Increasingly after 1600, the two developed a rivalry that was both personal, and political, and religious — for in their prominence they also became the chief exponents of the neighborhood schism, van Oldenbarnevelt championing the Remonstrants or Arminians (they remonstrated against some Calvinist doctrines) and Maurice upholding the orthodox Counter-Remonstrants or Gomarist side. The conflict was no joke; the States of Holland at van Oldenbarnevelt’s urging went so far as to hire its own mercenary army, knowing that it could not trust the national army commanded by the Counter-Remonstrant William. William secured the support of the States-General to forcibly disband this rival militia in July 1618† — and from that point until his death in 1625, William was the strongman in the Low Countries.
And van Oldenbarnevelt, well — he got the kangaroo court. See?
Detail view (click for the full image) of Satire on the trial of Johan van Oldenbarnevelt, by Cornelis Saftleven (1663). Saftleven liked painting animals.
Tried by a special (dubiously legal) court comprised of enemies, the grizzled pol was condemned to death as a traitor. On May 13, the day he went to the block at the Binnenhof in The Hague, his home province the States of Holland saluted him as “a man of great business, activity, memory and wisdom — yes, extra-ordinary in every respect.”
And it added a passage from Corinthians:
Die staet siet toe dat hij niet en valle
He who stands, let him take care that he does not fall
Detail view (click for the full image) of a 17th century engraving of Johan van Oldenbarnevelt’s beheading.
Van Oldenbarnevelt’s son Reinier, lord of Groeneveld was beheaded in 1623 for conspiring to assassinate Maurice in revenge for his father’s execution.
* Maurice of Orange was recognized in his time as perhaps Europe’s greatest and most innovative commander. His introduction of infantry volley fire and highly disciplined drill regimens revolutionized the battlefield — and made the Dutch very difficult for their Spanish masters to handle.
The Indian Ocean island-nation Mauritius, discovered by Dutch explorers in 1598, was named for him.
** Posterity has the luxury of hindsight knowledge that although war would resume for the Low Countries in 1621, the peace of Westphalia would secure an independent Netherlands. However, already during the Twelve Years’ Truce the place was acting as an independent country, and some other states formally recognized it as such.
† One of van Oldenbarnevelt’s supporters was international law pioneer Hugo Grotius. Grotius was clapped in prison with van Oldenbarnevelt’s fall in 1618; he famously escaped this dungeon in 1621 by hiding in a chest of books and lived out his scribbling days in France.