One, two, threeUntil the invention of the page number readers had no means to find a particular page in the book quickly. The system medieval scribes came up with is slightly different from our modern pagination. Only one side of each leaf was given a number, meaning that medieval "foliation" referred to not one but two pages. This image shows the Roman folium "xxxiiij" (34). The penciled "36" is modern (the number is different because it also counts two added flyleaves in front of the manuscript).