[5] The Dutch term usually specifically refers to the wave of disorderly attacks in the summer of 1566 that spread rapidly through the Low Countries from south to north.
Similar outbreaks of iconoclasm took place in other parts of Europe, especially in Switzerland and the Holy Roman Empire in the period between 1522 and 1566, notably Zürich (in 1523), Copenhagen (1530), Münster (1534), Geneva (1535), and Augsburg (1537).
In France, unofficial episodes of large scale destruction of art in churches by Huguenot Calvinists had begun in 1560; unlike in the Low Countries, they were often physically resisted and repulsed by Catholic crowds, but were to continue throughout the French Wars of Religion.
[7] In Anglican England much destruction had already taken place in an organized fashion under orders from the government,[8] while in Northern Europe, groups of Calvinists marched through churches and removed images, a move which "provoked reactive riots by Lutheran mobs" in Germany and "antagonized the neighbouring Eastern Orthodox" in the Baltic region.
[3][9] In Germany, Switzerland and England, conversion to Protestantism had been enforced on the whole population at the level of a city, principality or kingdom, with varying degrees of discrimination, persecution or expulsion applied to those who insisted on remaining Catholic.
The Low Countries[10] were part of the inheritance of Philip II of Spain, who was a devoted Catholic and supporter of the Counter-Reformation; he attempted to suppress Protestantism through his governor-general Margaret of Parma, the illegitimate daughter of Emperor Charles V, who was herself more willing to compromise.
[11] The region affected was perhaps the richest in Europe, but still seethed with economic discontent among parts of the population, and had suffered a poor harvest and hard winter.
Catholic preachers were interrupted in sermons, and raids were organized to release Protestant prisoners from jail, who then often fled into exile in France or England.
[14] These open-air sermons, mostly by Anabaptist or Mennonite preachers, spread through the country, attracting huge crowds, though not necessarily of those leaning to Protestantism, and in many places immediately preceded the iconoclastic attacks of August 1566.
"[21][22] Nicholas Sanders, an English Catholic exile who was a professor of theology at Louvain University, described the destruction in the same church: ... these fresh followers of this new preaching threw down the graven [sculpted] and defaced the painted images, not only of Our Lady but of all others in the town.
Iconoclasm in the north began later, after news of the events in Antwerp was received, and was more successfully resisted by local authorities in some towns, though still succeeding in most.
[37] Analysis of the records of the later trials shows a wide range of occupations, covering craftsmen and small tradespeople, especially in the textile trade, and also a variety of church employees, at a fairly low level.
[38] But Weyn Ockers, executed with her maid after their trials in 1568 for their actions on the first day of the Amsterdam outbreak, was the well-off married daughter of a notary, and her husband's house was in an expensive area.
[41] The van Eycks' Ghent Altarpiece, then as now famous as a supreme example of Early Netherlandish painting and already a major tourist attraction, just restored in 1550, was saved by dismantling it and hiding it in the cathedral tower.
When a larger attack was made at night two days later the iconoclasts had provided themselves with a tree trunk as a battering ram, and succeeded in breaking through the doors.
[48] On 23 August Margaret of Parma, the Habsburg Regent or Governor-general, whose capital of Brussels was unaffected by the movement, agreed to an "Accord" with the group of aristocratic Protestant leaders known as the "Compromise" or Geuzen ("Beggars"), by which freedom of religion was granted, in exchange for allowing Catholics to worship unmolested and an end to the violence.
Implementing the somewhat vague terms of the agreement led to further tensions, and William of Orange, appointed by Margaret to resolve the situation in Antwerp, tried and failed to produce a wider settlement that all parties could live with.
[51] Philip decided to send the Duke of Alba with an army; he would have led them himself but was kept in Spain by other matters, especially the increasingly evident insanity of his heir, Carlos, Prince of Asturias.
[52] When Alba arrived the following year, and soon replaced Margaret as Governor-general, his heavy-handed repression, which included the execution of many convicted of iconoclastic attacks the summer before, only made the situation worse.
[51] Antwerp was then Europe's largest financial and international trading centre, taking as much as 75 or 80% of English exports of cloth,[53] and the disturbances created serious and well-justified fears that its position as such was under threat.
"[54] The English had found the Antwerp money market short of funds since earlier in the year, and now made use of Cologne and Augsburg as well, but as events unfolded in the next year, and the personal position of some leading lenders became precarious, the English found to their surprise that repayments were no longer pressed for, probably as the lenders were happy to keep their money abroad on loan to a secure borrower.