Mercurius Politicus The triumph of the
Parliamentarians in the Civil War led to Nedham's incarceration in
Newgate Prison in June 1649; he gained his release in November by switching sides again. The result was perhaps his most significant enterprise, the weekly periodical
Mercurius Politicus, which he used as a platform for the
Commonwealth regime (Nedham received a government payment of £50 in May 1650, probably to start this venture). This third Nedham weekly began in June 1650, on a light note: "Why should not the Commonwealth have a Fool as well as the King had?" — but soon settled into a more serious vein as a voice of the republican movement of the day. He rested the case for the Commonwealth on arguments similar to those of
Hobbes: that "the Sword is, and ever hath been, the Foundation of all Titles to Government", and that it was hardly likely that the Commonwealth's adversaries would ever succeed in their designs.
Politicus continued for the next decade, the term of the Commonwealth era, under alternative titles like the
Public Intelligence or
Public Intelligencer. In 1655 Cromwell rewarded Nedham with an official post, so that Nedham was then perceived as a spokesman for the regime, albeit under the editorial aegis of
John Thurloe, spymaster of
Cromwell. With the royalist faction suppressed or in exile abroad, Nedham turned away from his previous scurrilous reporting and aimed to educate his readers in political principles of
humanism and republicanism. As the early radicalism of the Commonwealth began to wane, the revolutionary ideas expressed in
Politicus also softened, with a greater emphasis on the merit of a stable state. This did not mean that he did not on occasion criticise some of the conservative and authoritarian aspects of Cromwell's
Protectorate and, like others, called for a return to more republican ideals. The newspaper was widely read in England and Europe amongst exiles and Europeans alike. Another significant innovation was the inclusion of regular advertising. Nedham was associated with a set of influential republican writers of his generation, a circle that included
Algernon Sidney,
Henry Nevile,
Thomas Chaloner,
Henry Marten – and
John Milton. Milton, as a secretary to the Council of State in the early 1650s, would have overseen Nedham's publishing activity; later, the two men reportedly became personal friends. Nedham was notable as an advocate of the commercial interests of emerging capitalism in preference to the pillars of the older order. In 1652, he wrote that commercial interest "is the true zenith of every state and person...though clothed never so much with the specious disguise of religion, justice and necessity". Consistent with this outlook, Nedham translated
John Selden's
Mare Clausum (1636) as
Of the Dominion or Ownership of the Sea (1652). ==Restoration==