 The double quotation mark derives from a marginal notation used in fifteenth-century manuscript annotations to indicate a passage of particular importance (not necessarily a quotation); the notation was placed in the outside margin of the page and was repeated alongside each line of the passage.In his edition of the works of Aristotle, which appeared in 1483 or 1484, the Milanese Renaissance humanist Francesco Filelfo marked literal and appropriate quotes with oblique double dashes on the left margin of each line.Until then, literal quotations had been highlighted or not at the author's discretion.