What does the English Petition of Right prohibit the King from infringing upon?

The English Petition of Right, enacted in 1628, is a significant constitutional document that aimed to limit the powers of the monarchy and safeguard certain civil liberties. The correct focus of the Petition is on prohibiting the King from infringing upon specific liberties, including protections against unlawful imprisonment, the imposition of taxes without parliamentary consent, and quartering troops in private homes without consent.

While the Petition does touch on the idea of taxation without approval—making that an important aspect of its contents—the broader significance lies in its affirmation of specific liberties that cannot be violated by the King, such as the right to due process and the right to freely trade without excessive interference. Thus, it is accurate to assert that the central theme of the Petition is the protection of certain liberties against arbitrary royal authority.