page_title: Heidelberg
section_title: Modern history
hierarchical_section_title: Heidelberg / History / Modern history
caption_attribution_description: Bericht über die Belagerung und Einnahme Heildelbergs im Jahre 1622 durch Tilly
context_page_description: Heidelberg is a university town in the German state of Baden-Württemberg, situated on the river Neckar in south-west Germany. In the 2016 census, its population was 159,914, of which roughly a quarter consisted of students.
  Located about 78 km south of Frankfurt, Heidelberg is the fifth-largest city in Baden-Württemberg. Heidelberg is part of the densely populated Rhine-Neckar Metropolitan Region.
  Heidelberg University, founded in 1386, is Germany's oldest and one of Europe's most reputable universities. Heidelberg is a scientific hub in Germany and home to several internationally renowned research facilities adjacent to its university, including the European Molecular Biology Laboratory and four Max Planck Institutes. The city has also been a hub for the arts, especially literature, throughout the centuries, and it was designated a "City of Literature" by the UNESCO Creative Cities Network.
  Heidelberg was a seat of government of the former Electorate of the Palatinate and is a popular tourist destination due to its romantic cityscape, including Heidelberg Castle, the Philosophers' Walk, and the Baroque old town.
context_section_description: Heidelberg University played a leading part in the era of humanism and the Reformation, and the conflict between Lutheranism and Calvinism, in the 15th and 16th centuries. Heidelberg's library, founded in 1421, is the oldest existing public library in Germany. In April 1518, a few months after proclaiming his Ninety-five Theses, Martin Luther was received in Heidelberg, to defend them. In 1537, the castle located higher up the mountain was destroyed by a gunpowder explosion. The duke's palace was built at the site of the lower castle. 
  Elector Frederick III, sovereign of the Electoral Palatinate from 1559 to 1576, commissioned the composition of a new Catechism for his territory. While the catechism's introduction credits the "entire theological faculty here" (at the University of Heidelberg) and "all the superintendents and prominent servants of the church" for the composition of the catechism, Zacharius Ursinus is commonly regarded as the catechism's principal author. Caspar Olevianus (1536–1587) was formerly asserted as a co-author of the document, though this theory has been largely discarded by modern scholarship. Johann Sylvan, Adam Neuser, Johannes Willing, Thomas Erastus, Michael Diller, Johannes Brunner, Tilemann Mumius, Petrus Macheropoeus, Johannes Eisenmenger, Immanuel Tremellius and Pierre Boquin are all likely to have contributed to the Catechism in some way. Frederick himself wrote the preface to the Catechism and closely oversaw its composition and publication. Frederick, who was officially Lutheran but had strong Reformed leanings, wanted to even out the religious situation of his highly Lutheran territory within the primarily Catholic Holy Roman Empire. The Council of Trent had just concluded with its conclusions and decrees against the Protestant faiths, and the Peace of Augsburg had only granted toleration for Lutheranism within the empire where the ruler was Lutheran. One of the aims of the catechism was to counteract the teachings of the Roman Catholic Church as well as Anabaptists and "strict" Gnesio-Lutherans like Tilemann Heshusius and Matthias Flacius, who were resisting Frederick's Reformed influences, particularly on the matter of Eucharist (the Lord's Supper). The Catechism-based each of its statements on biblical proof-texts, and Frederick himself would defend it as biblical, not reformed, at the 1566 Diet of Augsburg when he was called to answer to charges of violating the Peace of Augsburg. This was the Heidelberg Catechism, officially called the ″Catechism, or Christian Instruction, according to the Usages of the Churches and Schools of the Electoral Palatinate.″
  In November 1619, the royal crown of Bohemia was offered to the Elector, Frederick V. (He was married to Elizabeth, eldest daughter of James VI and I of Scotland and England, respectively.) Frederick became known as the "Winter King", as he reigned for only one winter before the Imperial House of Habsburg regained the crown by force. His overthrow in 1621 marked the beginning of the Thirty Years' War. In 1622, after a siege of two months, the armies of the Catholic League, commanded by Johann Tserclaes, Count of Tilly, captured the town. Tilly gave the famous Bibliotheca Palatina from the Church of the Holy Spirit to the Pope as a present. The Catholic Bavarian branch of the House of Wittelsbach gained control over the Palatinate and the title of Prince-Elector.
  In late 1634, after the Swedish army had conquered Heidelberg, imperialist forces attempted to take back the city. They quickly took the city, but were unable to take the castle. As they prepared to blow up its fortifications with gunpowder the French army arrived, 30,000 men strong, led by Urbain de Maillé-Brézé, who had fought in many battles and participated in the Siege of La Rochelle (1627–1628), and Jacques-Nompar de Caumont, duc de La Force. They ended the siege and drove off the Catholic forces.
  In 1648, at the end of the war, Frederick V's son Charles I Louis, Elector Palatine, was able to recover his titles and lands. To strengthen his dynasty, Charles I Louis a
caption: The siege of Heidelberg 1622
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