It was a begining of making of a humble student of Indian history and numismatics. For doing study and research in the field of history, following avenues are explored. Apart from these, for study of medieval period, contemporary architecture and paintings can also be a good supplement. Very little written materials have survived today to give the complete and exact information of various ancient dynasties. The rock and other insriptions did survive but the limited numbers made them incomplete material.
Coins are perhaps one of the most important evidences for students of history.
Numismatic evidence is truly most correct as other forms are subject to exaggeration and might not provide information regarding extends of Kingdoms and dates. The names and portraits of rulers of these dynasties who otherwise were totally unknown to history are entirely deciphered from their coins. Changes in designs, inscription and scripts have further confirmed their nationality and migration. India has well studied history of 4500-5000 years. The study done at Mohenjadaro and Harappa ruins clearly shows a sophisticated and complex society which was prosperous because of its trade with other parts of India and also with other countries of Asia.