Based on our chronology, the Puranic Trētāyuga belongs to the Mature-Harappan Era (2600-2000 BCE). The kings of the Aikṣvāku line of Ayōdhya appear prominently in the Trētāyuga. To comprehend the origins of the Harappan Civilization, we need to have a clear identification of their capital. Identification of the Sarayu in the Indus system is critical to locate Ayōdhya in the Harappan milieu and let’s see if there is anything in tradition to tip us off.
