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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With World War I an entire system of ideas how wars work collapsed. Suddenly it was no longer mostly soldiers who had to fight. War became an engagement of every day's life. Everybody got involved.
Propaganda therefore changed as well. The campaigns were no longer temporarily and recent but had to be planned for years. Who failed in organizing it or used the wrong keywords failed. Masters of modern propaganda became the British, whereas the Germans failed completely in the beginning.
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Ronald L. Rivest is Webster Professor of Electrical Engineering and Computer Science in MIT's EECS Department. He was one of three persons in a team to invent the
Galileo Galilee (1564-1642), the Italian Mathematician and Physicist is called the father of Enlightenment. He proofed the laws of the free fall, improved the technique for the telescope and so on. Galilee is still famous for his fights against the Catholic Church. He published his writings in Italian instead of writing in Latin. Like this, everybody could understand him, which made him popular. As he did not stop talking about the world as a ball (the Heliocentric World System) instead of a disk, the Inquisition put him on trial twice and forbid him to go on working on his experiments.