The chronic and complex problems in the study of ancient Indian chronology arise from a misunderstanding of the epochs of ancient Indian eras. Based on the epigraphic and literary evidence, we can conclusively fix the epochs of ancient Indian eras starting from the date of Buddha nirvana. There is abundance of epigraphic, archaeological and literary evidence for the critical study of the chronology of ancient India. Unfortunately, the exact epochs of certain ancient eras were forgotten by 10th and 11th centuries. Thus, we need to debate and establish the true epochs of ancient Indian eras.