Epigraphic documents have generally been considered the most reliable as they are often contemporary to the period they talk about. Epigraphic sources have been used extensively for reading early Indian history. Indian Epigraphical Glossary, epigraphy is a sine qua non for constructing the political and cultural history of ancient India. Paleography is the study of pre-modern manuscripts and numismatics is the study of coin collection. These help us understand the history and act as a link between the present and the past.