Haarlem has had a Christian parish church since the 9th century. This first church was a "daughter church" of Velsen, which itself was founded in 695 by St. Willibrord. This early first church was a wooden church on the same site of the current Sint-Bavokerk. Extensions and expansions over the centuries led to its formal consecration in 1559 when the first bishop Nicolaas van Nieuwland was appointed. Only 19 years later, after the Spanish occupation ended (they won the Siege of Haarlem) and Haarlem reverted to the Protestant House of Orange, the church was confiscated during the episode known as the "Haarlemse noon" and converted to Protestantism as part of the Protestant Reformation.