Editing Manuscript (section)

===Liturgical books and calendars===
[[Image:De urinarum differencia negocium between 1210 and 1230 ..JPG|thumb|right|Image of two facing pages of the illuminated manuscript of "Isagoge", fols. 42b and 43a. On the top of the left hand page is an illuminated letter "D" - initial of "De urinarum differencia negocium" (The matter of the differences of urines). Inside the letter is a picture of a master on bench pointing at a raised flask while lecturing on the "Book on urines" of Theophilus. The right hand page is only shown in part. On its very bottom is an illuminated letter "U" - initial of "Urina ergo est colamentum sanguinis" (Urine is the filtrate of the blood). Inside the letter is a picture of a master holding up a flask while explaining the diagnostic significance of urine to a student or a patient. HMD Collection, MS E 78.]]
Along with Bibles, large numbers of manuscripts made in the Middle Ages were revieved in Church. Due to the complex church system of rituals and worship these books were the most elegantly written and finely decorated of all medieval manuscripts. Liturgical books usually came in two varieties. Those used during mass and those for divine office.

Most liturgical books came with a calendar in the front. This served as a quick reference point for important dates in Jesus' life and to tell church officials which saints were to be honored and on what day. 

Almost all medieval calendars give each day's date according to the Roman method of reckoning time. In the Roman system, each month had three fixed points known as Kalends (Kal), the Nons and the Ides. The Nones fell on the fifth of the month in January, February, April, June, August, September, November and December, but on the seventh of the month in March, May, July and October. The Ides fell on the thirteenth in those months in which the Nones fell on the fifth, and the fifteenth in the other four months. All other days were dated by the number of days by which they preceded one of those fixed points.