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He also compiled a valuable catalogue of the manuscripts in Leiden University Library, wrote a history of the Greek sophists, and translated various German works into Dutch.
It is not to be confused with the "Leiden St Louis Psalter", (Latin, Parchment, 185 folios, 24,5 x 17,7 cm. 23 miniatures. Historiated initials. Northern England, 1190-1200. Leiden, University Library: BPL 76A) originally produced for Geoffrey Plantagenet, Archbishop of York, probably in northern England in the 1190s.