Thomas Hobbes (1588-1679) was an English philosopher considered one of the founders of modern political philosophy. His most famous work is Leviathan (1651), where he laid the foundations of contractualist theory, which had a significant influence on the development of Western political philosophy. Leviathan, as it is commonly known, is undoubtedly the most important and groundbreaking work of the 17th-century English philosopher, politician, and thinker Thomas Hobbes. Referencing and writing with splendid mastery, the author invokes the most feared biblical monster to explain and justify the existence of an absolutist State that subjugates its citizens. Written in 1651, his work has been a great inspiration in political sciences and, paradoxically, in the evolution of social law.