Behemoth was written in or around 1667; Leviathan was published in 1651. But I want to start earlier. Just how early one can safely start is, as we will shortly see, a difficult question. For now let us stay on safe ground. In 1629 Hobbes published his translation of Thucydides, including that most compact of all analyses of power politics, the Melian dialogue. There the Athenian ambassadors swiftly reject arguments from right, justice, or principle as irrelevant, and assume such arguments will be recognized to be so:

There is an evident similarity between the Athenian view and Hobbes's insistence over twenty years later in Leviathan that there could be neither contract nor justice without a sovereign authority. Yet recent scholarship has tended to take Hobbes at his word when he insists that Leviathan is a work of geometrical and not historical argument, written under the influence of Euclid and not Thucydides. Consequently hardly anyone refers to the Melian dialogue when interpreting Leviathan. Hobbes the translator of history is presumed to be irrelevant to Hobbes the theorist of politics.