The Computus Runicus was a runic calendar produced in 1328 and found on the Swedish island of Gotland.A transcription/description of the text - called Computus Runicus - was published in 1626 by the Danish physician and antiquarian Ole Worm (Olaus Wormius) (1588–1654).The calendar is written in medieval runes with a gloss in Latin and some places also in Swedish added by Worm.It follows a standard layout for a Medieval calendar similar to those found in a book of hours, with Christian feasts and saint's days.The author used a similar system of rune replacements for the Latin letters and Roman numerals as those commonly found in other runic calendars, including the use of the extra runes Arlaug, Tvimadur, and Belgthor to represent the Golden Numbers 17, 18, and 19.
