Oude Kerk, Amsterdam. The Oude Kerk is Amsterdam's oldest building and oldest parish church, founded circa 1213 and consecrated in 1306 by the bishop of Utrecht with Saint Nicolas as its patron saint. After the Reformation in 1578, it became a Calvinist church, which it remains today. It stands in De Wallen, now Amsterdam's main red-light district. The square surrounding the church is the Oudekerksplein. By around 1213, a wooden chapel had been erected at the location of today's Oude Kerk. Over time, this structure was replaced by a stone church that was consecrated in 1306. The church has seen a number of renovations performed by 15 generations of Amsterdam citizens. The church stood for only a half-century before the first alterations were made; the aisles were lengthened and wrapped around the choir in a half circle to support the structure. Not long after the turn of the 15th century, north and south transepts were added to the church creating a cross formation. Work on these renovations was completed in 1460, though it is likely that progress was largely interrupted by the great fires that besieged the city in 1421 and 1452. This delayed the building for almost 1 year. Before the Alteratie, or Reformation in Amsterdam of 1578, the Oude Kerk was Roman Catholic. Following William the Silent's defeat of the Spanish in the Dutch Revolt, the church was taken over by the Calvinist Dutch Reformed Church. Throughout the 16th-century battles, the church was looted and defaced on numerous occasions, first in the Beeldenstorm of 1566, when a mob destroyed most of the church art and fittings, including an altarpiece with a central panel by Jan van Scorel and side panels painted on both sides by Maarten van Heemskerck. Only the paintings on the ceiling, which were unreachable, were spared. Locals would gather in the church to gossip, peddlers sold their goods, and beggars sought shelter. This was not tolerated by the Calvinists, however, and the homeless were expelled. In 1681, the choir was closed-off with an oak screen. Above the screen is the text, The prolonged misuse of God's church, were here undone again in the year seventy-eight, referring to the Reformation of 1578. In that same year, the Oude Kerk became home to the registry of marriages. It was also used as the city archives; the most important documents were locked in a chest covered with iron plates and painted with the city's coat of arms. The chest was kept safe in the iron chapel. The bust of famous organist and composer Jan Pieterszoon Sweelinck celebrates the lifetime he spent playing in the church. His early career began at the age of fifteen when he succeeded his deceased father Pieter Swybertszoon as the Oude Kerk's organist. He went on to compose music for all 150 Psalms and secured an international reputation as a leading Dutch composer. His music would also be played over the city from the church's bell tower. He is buried in the church. Rembrandt was a frequent visitor to the Oude Kerk and his children were all christened here. It is the only building in Amsterdam that remains in its original state since Rembrandt walked its halls. In the Holy Sepulchre is a small Rembrandt exhibition, a shrine to his wife Saskia van Uylenburgh who was buried here in 1642. Each year on 9 March, at 8:39 am, the early morning sun briefly illuminates her tomb. An early spring breakfast event is held annually. The church covers an area of some 3,300 m 2. The foundations were set on an artificial mound, thought to be the most solid ground of the settlement in this marshy province. The roof of the Oude Kerk is the largest medieval wooden vault in Europe. The Estonian planks date to 1390 and boast some of the best acoustics in Europe. The Oude Kerk contains 12 misericords, leaning posts installed underside folding seats. The floor consists entirely of gravestones. The reason for this is that the church was built on a cemetery. Local citizens continued to be buried on thesite within the confines of the church until 1865.