What are the most important cases regarding freedom of speech?

I am doing a project for government and any other information would be beneficialWhat are the most important cases regarding freedom of speech?
Galileo Galilei. He was censured for trying to say that the the earth revolves around the sun, not vice versa. This went against the official dogma of the Roman Catholic church, and he was forced to recant rather than be tried of heresy, and spent his last years a virtual prisoner of the Inquisition.





Despite this, Galileo's ideas filtered out and were steadily accepted. The authority of the church was increasingly questioned, and their block on freedom of speech and expression was increasingly resisted. The Reformation was strengthened by such cases.





This contributed to the Glorious Revolution and the Enlightenment; the birthplace of many of the political and social freedoms we take for granted, as well as the rapid scientific and technical progress that followed as a consequence.





Edit:


Jeremy W- yes indeed, that would be Giordano Bruno, who had an unpleasantly fiery end. However, although he was a geocentrist, his case was more about theological issues, and Galileo's has the significance of being the first to significantly involve the use of (or refusal to accept) testable evidence.What are the most important cases regarding freedom of speech?
Galileo got off lightly. There was a monk around at about the same time, name of Bruni or somesuch, who also proposed heliocentricity and was burned at the stake for it. Maybe he didn't have one of Galileo's telescopes to help him defend his views.