Thomas Hobbes wrote Leviathan, first published in 1651. The work is titled The Matter, Forme and Power of a Commonwealth Ecclesiasticall and Civil and is commonly referred to as Leviathan. It argues for a social contract and an absolute sovereign to avert the state of nature, often summarized by the phrase "solitary, poor, nasty, brutish, and short" (though that exact wording appears in popular summaries rather than the original text). If you’d like, I can provide a brief overview of its main ideas, historical context, and key passages.