THE IMPORTANCE OF THE SPIES IN ANCIENT INDIAN DIPLOMACY

Intelligence studies is a sub-discipline of international relations. The topic has been covered in detail in Kutilya's ARTHASASTRA. In ancient Indian traditions, intelligence has always been an important part of statecraft. See my  considerations about ARTHASASTRA OF KAUTILYA on the web.
CASALINO PIERLUIGI, LAIGUEGLIA'S SCHOLAR, 1949, WHO LIVES IN IMPERIA, ON THE WEB