Hobbes's articulation of this long-contemplated philosophy of political and natural science was finally published in 1651, two years after the overthrow and execution of King Charles I. It met with a firestorm of controversy that included charges of treason and sedition, but survived to rank among the greatest works in the history of ideas. This edition of Hobbes's landmark work is based on the original text, offering both flavorful authenticity and the utmost clarity of expression.