Guillaume Rouillé

Guillaume Rouillé, also called Roville or Rovillius, was one of the most prominent humanist bookseller-printers in 16th-century Lyon. He invented the pocket book format called the sextodecimo, printed with sixteen leaves to the folio sheet, half the size of the octavo format, and published many works of history and poetry as well as medicine, in addition to his useful compilations and handbooks.