Foliono is a package that replaces page numbering with medieval and early modern folio numbering. Folio numbering was used before modern page numbering convention came to use. In its basic form only every other page has a number and it has two parts: the quire number and the folio number inside the quire. A quire or a gathering is a collection of sheets that are bound into the book as one unit. For example, if a book has four-sheet quires, then each quire will have 16 modern pages and the folio 'B 1' corresponds to the modern page 17 and 'B 2' to page 19. The foliono package has direct support for several different folio numbering conventions that were used in books before the 19th century. The package works best in conjunction with fancyhdr and fontspec, but it can be used without them. This package is distributed under the Latex Project Public License (LPPL). -- Tommi Syrjänen