formed in the Middle Vedic period (c. 1200 – c. 900 BCE) as a result of the alliance and merger between the Bharata and other Puru clans, in the aftermath of the Battle of the Ten Kings. With their center of power in the Kurukshetra region, the Kurus formed the first political center of the Vedic period, and were dominant roughly from 1200 to 800 BCE. The first Kuru capital was at Āsandīvat, identified with modern Assandh in Haryana. Later literature refers to Indraprastha (identified with modern Delhi) and Hastinapura as the main Kuru cities. The Kurus figure prominently in Vedic literature after the time of the Rigveda. The Kurus here appear as a branch of the early Indo-Aryans, ruling the Ganga-Yamuna Doab and modern Haryana. The focus in the later Vedic period shifted out of Punjab, into the Haryana and the Doab, and thus to the Kuru clan. This trend corresponds to the increasing number and size of Painted Grey Ware (PGW) settlements in the Haryana and Doab area. Archaeological surveys of the Kurukshetra District have a revealed a more complex (albeit not yet fully urbanized) three-tiered hierarchy for the period of period from 1000 to 600 BCE, suggesting a complex chiefdom or emerging early state, contrasting with the two-tiered settlement pattern (with some "modest central places", suggesting the existence of simple chiefdoms) in the rest of the Ganges Valley. Although most PGW sites were small farming villages, several PGW sites emerged as relatively large settlements that can be characterized as towns; the largest of these were fortified by ditches or moats and embankments made of piled earth with wooden palisades, albeit smaller and simpler than the elaborate fortifications which emerged in large cities after 600 BCE. The Atharvaveda (XX.127) praises Parikshit, the "King of the Kurus", as the great ruler of a thriving, prosperous realm. Other late Vedic texts, such as the Shatapatha Brahmana, commemorate Parikshit's son Janamejaya as a great conqueror who performed the ashvamedha (horse-sacrifice). These two Kuru kings played a decisive role in the consolidation of the Kuru state and the development of the srauta rituals, and they also appear as important figures in later legends and traditions (e.g., in the Mahabharata). The Kurus declined after being defeated by the non-Vedic Salva (or Salvi) tribe, and the center of Vedic culture shifted east, into the Panchala realm, in Uttar Pradesh (whose king Keśin Dālbhya was