This is the first critical bibliography of one of the most intricate bibliographical cases of early-modern Europe: the Tesori politici (1589-1618). For the first time, printers involved in the publication, dedicatees, and many authors of the various texts have been identified; the complete content of the various editions, reprints, and translations exposed; texts are referred to manuscript versions held in the British Library, and elsewhere in Britain. The research shows the difference between the three Tesori politici ; reveals the previously unknown, wide circulation the Tesori politici enjoyed in Britain; and suggests they were important publications for the development of the contemporary discourse on raison d'etat .