Leiden University Libraries is a library founded in 1575 in Leiden, Netherlands. It is regarded as a significant place in the development of European culture: it is a part of a small number of cultural centres that gave direction to the development and spread of knowledge during the Enlightenment. This was due particularly to the simultaneous presence of a unique collection of exceptional sources and scholars. Holdings include approximately 5,200,000 volumes, 1,000,000 e-books, 70,000 e-journals, 2,000 current paper journals, 60,000 Oriental and Western manuscripts, 500,000 letters, 100,000 maps, 100,000 prints, 12,000 drawings and 300,000 photographs. The library manages the largest collections worldwide on Indonesia and the Caribbean. Furthermore, Leiden University Libraries is the only heritage organization in The Netherlands with three registrations of documents in UNESCO's Memory of the World Register.

"Est hic magna commoditas bibliothecae ut studiosi possint studere"

Josephus Justus Scaliger"The greatest advantage of the library is that those who want to study, can study."

A nomenclator ( NOH-mən-KLAY-tər; English plural nomenclators, Latin plural nomenclatores; derived from the Latin nomen- name + calare - to call), in classical times, referred to a slave whose duty was to recall the names of persons his master met during a political campaign. Later this became names of people in any social context and included other socially important information.However, it has taken on several other meanings and also refers to a book containing collections or lists of words. It also denotes a person, generally a public official, who announces the names of guests at a party or other social gathering or ceremony.In more general terms still, it is a person who provides or creates the names for things, and this can apply to the application of names in a scientific or any other context, but especially in relation to specialist terminologies, glossaries etc.