In the beginnings of Christianity most people were illiterate. Therefore the Bible had to be transformed into pictures and symbols; and not only the stories but also the moral duties of everybody. Images and legends of the Saints turned out as useful models for human behavior - easy to tell and easy to understand.
Later, when the crusades began, the Christian Church used propaganda against Muslims, creating pictures of evil, pagan and bloodcurdling people. While the knights and others were fighting abroad, people in Europe were told to pray for them. Daily life was connected to the crusades, also through money-collections - more for the cause of propaganda than for the need of money.
During the period of the Counter-Reformation Catholic propaganda no longer was against foreigners but turned against people at home - the Protestants; and against their publications/books, which got prohibited by starting the so-called index. By then both sides were using disinformation for
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The first of the great medieval universities was established at Bologna. At the beginning, universities predominantly offered a kind of do-it-yourself publishing service.
Books still had to be copied by hand and were so rare that a copy of a widely desired book qualified for being invited to a university. Holding a lecture equaled to reading a book aloud, like a priest read from the Bible during services. Attending a lecture equaled to copy a lecture word by word, so you had your own copy of a book, thus enabling you to hold a lecture, too.
For further details see History of the Idea of a University,