janapadas kosala magadha kingdoms political kingdom buddhist capitals cities selfstudyhistory sixteen upsc monarchies magadh nanda empires sakya territory
age period history vedic later bc 600 indian map india ancient kosala urbanization second which matsya avanti
ancient 6th magadha indus 600bc anga vaishali avanti period mahabharat sixteen kashi locate matsya empire rise ias janapada worldhistory