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How do inscriptions help establish dates for events in ancient India?

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Neo-Assyrian clay tablet from the 7th century BC inscribed with dense cuneiform writing, known as the Flood Tablet from the Epic of Gilgamesh, displayed in the British Museum. — epigraphy The Flood Tablet, 11th cuneiform tablet in a series relating the Gilgamesh epic, from Nineveh, 7th century bce; in the British Museum, London.

Inscriptions serve as a vital tool for establishing chronology in ancient India, where traditional literary sources often lack precise dating. Because inscriptions are typically physical objects created contemporaneously with the events they record, they provide a reliable historical anchor.1

The most significant contribution comes from the edicts of the Mauryan emperor Ashoka. These inscriptions provide essential synchronisms—links to known historical figures in the Mediterranean world, such as Antiochus II Theos and Ptolemy II Philadelphus. By correlating these contemporary rulers with established Western dates, historians can fix Ashoka’s reign in time, creating a foundation for Indian chronology.21

Furthermore, inscriptions introduced the practice of recording dates based on a king’s consecration (abhiseka) or specific dynastic eras, such as the Saka or Vikrama eras. While some regnal dates remain uncertain, these epigraphic records allow scholars to establish relative chronologies and, when linked to external data, absolute dates for various Indian dynasties.3