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The Leyden manuscript (Dornskrid Leiden) is the name usually given in Breton studies to a four-page leaflet ("bifolio") kept in Leiden University Libraries in the Netherlands (shelfmark: Vossianus latinus folio 96 A). It is a fragment of a Latin medical treatise dating from the 9th or late 8th century in which two Irish words appear and about thirty Old Breton words.