The modern study of international law starts in the early 19th century, but its origins go back at least to the 16th century, and Alberico Gentili, Francisco de Vitoria and Hugo Grotius, the "fathers of international law. '' Several legal systems developed in Europe, including the codified systems of continental European states and English common law, based on decisions by judges and not by written codes. Other areas developed differing legal systems, with the Chinese legal tradition dating back more than four thousand years, although at the end of the 19th century, there was still no written code for civil proceedings. Some doubt the effectiveness of international law, as they see the implementation of international law as a policy option among others to tackle global dilemmas. They say that international law must be evaluated with other, possibly more effective, international law options.
who is often regarded as the father of international law
Alberico Gentili Francisco de Vitoria Hugo Grotius