Vajji was a mahajanapada towards the north of Ganga in the division of Tirhut. It was a confederacy of eight or nine clans. The capital of Vajji mahajanapada was situated at Vaishali.
Viharas were for the purpose of living, Chaityas were assemblies for the purpose of discussions. Further, Chaityas were with Stupas, Viharas did not have stupas.
Though the Satavahanas made liberal sacrificial fees to the Brahmanas, they also promoted Buddhism. Some of the important Buddhist sites under the Satavahanas were Nagarjunakonda and Amravati in Andhra Pradesh and Nashik and Junar areas of Maharashtra.
The Ikshavakus arose on the ruins of Satavahana power in eastern part of the peninsula in India. The Ikshavakus left behind many monuments at Nagarjunkonda and Dharanikota. They were a local tribe.
The Capital of Magadh empire was situates at Rajgriha or Girivraja. The city was almost impregnable as it was surrounded by five hills, the openings in which were closed by stone walls on all sides.