One of the sixteen Mahajanapadas, centered on the Braj region of the Yamuna valley with its capital at Mathura; mentioned in the Ramayana and by the Greek envoy Megasthenes (as the Sourasenoi).
Absorbed into the expanding Magadhan/Mauryan sphere by the late 4th century BC.
Covers Surasena/Mathura as one of the sixteen Mahajanapadas.