A prose tract or polemic by John Milton, published November 23, 1644, at the height of the English Civil War... Milton, though a supporter of the Parliament, argued forcefully against the Licensing Order of 1643, noting that such censorship had never been a part of classical Greek and Roman society. The tract is full of biblical and classical references which Milton uses to strengthen his argument. The issue was personal for Milton as he had suffered censorship himself in his efforts to publish several tracts defending divorce (a radical stance at the time and one which met with no favor from the censors)... Areopagitica is among history's most influential and impassioned philosophical defences of the principle of a right to free speech. (Summary by Wikipedia)
