Bavo is the patron saint of Ghent in Belgium and Haarlem. He was born in 589 AD, became a soldier and was later converted to be a Christian monk and donated his worldly possessions and time to the poor.
This was all during the era of the Catholic Church. But the 'Reformation' that took place during the 16th and 17th century changed all of this. Anabaptism, or the believe that a person should be baptized when he/she is old enough to know right from wrong rather than as an infant, became very popular in the low countries. John Calvin added to this with his teachings of absolute obedience to God. At the time Spain technically
owned the country. The Spanish started harsh prosecution campaigns in the name of 'Inquisition', who were believers and who were not. The people in the north rebelled. This led to the 'Beeldenstorm' or 'Statue storm' of 1566. People went crazy and in groups entered the churches to destroy religious depictions of biblical scenes. Statues, paintings and other religious emblems and treasures were plundered and burst to pieces and burnt. The Spanish retaliated and it was the start of the 'Eighty Year War'. It finally ended in 1648 with the Treaty of Westphalia where the Netherlands was recognized as an independent state. But the damage to the church buildings, the removal of all 'icons' and the death of several priests would remain a blemish for ever.