Why was freedom of speech important?

 Henry Bolingbroke, son of John Gaunt, became Henry IV, King of England after deposing, Richard II. Parliament played an important role in making him the king, and so, Henry IV was willing to agree to its many demands. One of these demands was that the members of parliament be given the freedom to discuss, and speak on any matter without fear of arrest. In effect, the House of Commons was asking for freedom of speech, and Henry agreed to this request. So, the reign of Henry IV saw the foundation laid for one of the most scared privileges of democracy today- freedom of speech.