The Janapadas were the realms, republics (ganapada) and kingdoms (sāmarājya) of the Vedic period in the Indian subcontinent. The Vedic period reaches from the late Bronze Age into the Iron Age: from about 1500 BCE to the 6th century BCE. With the rise of sixteen Mahajanapadas, most of the states were annexed by more powerful neighbours, although some remained independent.

The Vedic period, or the Vedic age, is the period in the late Bronze Age and early Iron Age of the history of India when the Vedic literature, including the Vedas, was composed in the northern Indian subcontinent, between the end of the urban Indus Valley Civilisation and a second urbanisation, which began in the central Indo-Gangetic Plain c. 600 BCE. The Vedas are liturgical texts which formed the basis of the influential Brahmanical ideology, which developed in the Kuru Kingdom, a tribal union of several Indo-Aryan tribes. The Vedas contain details of life during this period that have been interpreted to be historical and constitute the primary sources for understanding the period. These documents, alongside the corresponding archaeological record, allow for the evolution of the Indo-Aryan and Vedic culture to be traced and inferred.