Leaf on vellum from a manuscript Bible.

Manuscript Bible leaf on vellum, more than 700 years old!! Probably from France.
The Bible has, of course, always been the center of Christianity from the beginning, but as a book it was always in parts : to be read at certain times. The priests and monks studied the Psalms, or the Gospels, or the Minor Prophets, for instance. In Paris the birth of the Bible as one book took place, around 1200. There the Bible was put in a single volume, the order and names of the biblical books were standardized, and the text was checked for accuracy. For the first time the text was divided up into numbered chapters. The name that is attached to this is Stephen Langton, he of the Magna Charta!
More important for us : the physical appearance of the book changed! The pages became very small, the scribes employed headings at the top of the page and used blue and red initials to mark the beginning of each chapter. ( There was not yet a division into verses, this happened in the 16th century.)
It is thought that the Franciscan and Dominican friars, when they travelled preaching through Europe, spread the use of the Bible in one volume, and the Bibles were produced in such quantities that two centuries later they were still in use. ( For more on this subject see : A history of illuminated manuscripts, by Christopher De Hamel, whose work was used for this information.)
The text is in two columns, 50 lines, with 2 initials with pen work in red and blue. The name of the book is in red and blue letters at the top of the page.
The text is from the last part of Matthew and the beginning of Mark. See the pretty initials M and I