|Latin: Academia Lugduno-Batava|
|Motto||Libertatis Praesidium (Latin)|
Motto in English
|Bastion of Freedom|
|Type||Public research university|
|Established||8 February 1575|
|Budget||€588 million (2016)|
|Location||Leiden and The Hague, South Holland, Netherlands|
Leiden University (abbreviated as LEI; Dutch: Universiteit Leiden), founded in the city of Leiden, is the oldest university in the Netherlands. The university was founded in 1575 by William, Prince of Orange, leader of the Dutch Revolt in the Eighty Years' War. The Dutch Royal Family and Leiden University still have a close relationship; Queens Juliana and Beatrix and King Willem-Alexander are former students. The university came into particular prominence during the Dutch Golden Age, when scholars from around Europe were attracted to the Dutch Republic due to its climate of intellectual tolerance and Leiden's international reputation. During this time Leiden was home to such figures as René Descartes, Rembrandt, Christiaan Huygens, Hugo Grotius, Baruch Spinoza and Baron d'Holbach.
Leiden University has seven faculties (six in Leiden and one in The Hague), over 50 departments. The university is a member of the Coimbra Group, the Europaeum and the League of European Research Universities. Leiden University houses more than 40 national and international research institutes.
The University is associated with ten leaders and Prime Ministers of the Netherlands including the current Prime Minister Mark Rutte, nine foreign leaders, among them the 6th President of the United States John Quincy Adams, a Secretary General of NATO, a President of the International Court of Justice, a Prime Minister of the United Kingdom and sixteen recipients of the Nobel Prize (including renowned physicists Albert Einstein and Enrico Fermi).