De veritate religionis Christianæ. With English Notes and Illustrations, for the Use of Students, by J. E. Middleton

Huig de Groot (Latinized Hugo Grotius) is widely acknowledged as the first writer on international law. His work De jure belli et pacis, which Grotius wrote after escaping Dutch imprisonment for suspected treason, commands general appreciation for its establishment of codes of conduct in war and promotion of peace. Grotius argued for nations' free use of oceans in Mare liberum, and argued against Calvinist doctrines in an essay on free will. His brilliance won him a significant diplomatic role in western Europe, where he was particularly involved with French and Swedish politics.