Thomas Hobbes and Political Thought in Ireland, c.1660-1730 is a history of political thought in Ireland, told from the perspective of the reception in that country of Thomas Hobbes, the English philosopher. Unlike Hobbes, political thought in Ireland has received little attention from historians: it is sometimes assumed that there is not much of a subject to study. The reception of Hobbes in Ireland forces us to challenge this assumption.To begin with, Matthew Ward highlights the variety and sophistication of political thought in Ireland. In his political thought, Hobbes was preoccupied by sovereignty, which he conceptualized in terms of natural law and made the defining characteristic of the commonwealth, or the 'Leviathan'; but he applied his concept of sovereignty to a broad range of political issues. His political thought was also part of a wider philosophical system which comprehended history, theology, natural philosophy, and mathematics. They may have been fewer than their counterparts in England, but Hobbes's readers in Ireland read him closely and compulsively. Indeed, they often fixated on his treatment of subjects, such as taxation, corporations, and the organization of empire, that were overlooked by his readers in England.The reception of Hobbes in Ireland also tells, therefore, of the distinctiveness of Ireland as a context of political thought. Hobbes's readers in Ireland were not only concerned with a distinctive selection of subjects; they also received Hobbes more positively than his readers in England. In England, Hobbes's concept of sovereignty was reviled for emasculating Parliament, the Anglican Church, and the common law. Too compelling to ignore, the 'Leviathan' had to be 'tamed'. In Ireland, where these institutions were weaker, the 'Leviathan' could be released.The key figures in the reception of Hobbes in Ireland in this period- Sir William Petty, John Vesey, and Edward Synge- were of different generations and political contexts. All three, however, engaged with aspects and implications of Hobbes's concept of sovereignty, to which they more sympathetic than their English contemporaries, to intervene in Irish politics. They prompt us to consider the geography of the discourse of sovereignty in the British world, not only in those days, but also in these.