This is a festschrift in honour of Arnoud Vrolijk, the emeritus curator of Oriental manuscripts and rare books at Leiden University Libraries. His title of Interpres Legati Warneriani refers to the role of keeper of the manuscripts bequeathed to the Library of the University of Leiden by Levinus Warner in 1665. The eighteen articles, ranging from book history to manuscript studies, philology and oriental art, reflect Vrolijk's many interests and activities. Each of the contributions touches upon at least one of the fields Arnoud is interested in, has worked on, or both. All articles also deal with the collection of knowledge, and how it has been brought together, been preserved, and has been – and is being – disseminated in East and West.