Leiden University

Leiden University (abbreviated as LEI; Dutch: Universiteit Leiden) is a public research university in Leiden, Netherlands. Established in 1575 by William, Prince of Orange as a Protestant institution, it holds the distinction of being the oldest university in the Netherlands of today.

During the Dutch Golden Age scholars from around Europe were attracted to the Dutch Republic for its climate of intellectual tolerance. Individuals such as René Descartes, Rembrandt, Christiaan Huygens, Hugo Grotius, Benedictus Spinoza, and later Baron d'Holbach were active in Leiden and environs.

The university has seven academic faculties and over fifty subject departments, housing more than forty national and international research institutes. Its historical primary campus consists of several buildings spread over Leiden, while a second campus located in The Hague houses a liberal arts college (Leiden University College The Hague) and several of its faculties. It is a member of the Coimbra Group, the Europaeum, and a founding member of the League of European Research Universities.

The university has produced twenty-six Spinoza Prize Laureates and sixteen Nobel Laureates. Members of the Dutch royal family such as Queen Juliana, Queen Beatrix, and King Willem-Alexander are alumni, and ten prime ministers of the Netherlands including Mark Rutte. US president John Quincy Adams also studied at the university.

In 1575, the emerging Dutch Republic did not have universities in its northern heartland. The only other university in the Habsburg Netherlands was the University of Leuven located in an area under firm Spanish control. Prince William founded Leiden University to give the Northern Netherlands an institution that could educate its citizens in religion and provide the government with educated men in all fields. It is said the choice fell on Leiden as a reward for the heroic defence of Leiden against Spanish attacks in 1574. The name of Philip II of Spain, William's adversary, appears on the official foundation certificate as he was still the de jure count of Holland. Philip II forbade all his subjects to study in Leiden.

The new institution was initially located in the Convent of Saint Barbara, then moved to the Faliede Bagijn Church in 1577 (now the location of the university museum) and in 1581 to a former convent of Cistercian nuns, a site which it still occupies, though the original building was destroyed by a fire in 1616.

Leiden University's reputation was created in part by the presence of scholars such as Justus Lipsius, Joseph Scaliger, Franciscus Gomarus, Hugo Grotius, Jacobus Arminius, Daniel Heinsius, and Gerhard Johann Vossius within fifty years of its founding. By the 1640s, over five hundred students were enrolled from all across Europe, making it the largest Protestant university. Baruch Spinoza discovered Descartes's work partly at Leiden University, which he visited for periods of study multiple times. In the 18th century, Jacobus Gronovius, Herman Boerhaave, Tiberius Hemsterhuis, and David Ruhnken were among the renowned academics of the university.

In 1896, the Zeeman effect was discovered at the institution by Pieter Zeeman and shortly afterward explained by Hendrik Antoon Lorentz. In the world's first university low-temperature laboratory, Professor Heike Kamerlingh Onnes achieved a temperature only one degree above absolute zero. In 1908, he was also the first to succeed in liquifying helium and has played a role in the discovery of superconductivity in metals.