In the epic battle fought in Kurukshetra, north of Delhi, between the Pandavas and Kauravas, all the major kingdoms and tribes of the sub-continent are pitched in battle against each other. The Kings of Madhyadesa and Kasi, Kosala, Magadha, Matsya, Chedi,  and the Yadus of Mathura are allied with Pandavas; the allies of Kauravas comprise the King of Pragjyotish, the Kambojas, Yavanas, Sakas, Kaikeyas, Sindhus and Sauviras, Mahishmati and Avanti in Madhyadesa. 

Mahabharata, the single longest poem of the world, enunciates the core values of Kshatriya kingship: Truthfulness and honour; valor and sacrifice for the kingdom; ethical code in peace and war; respect for the Guru or teacher; loyalty and gratitude. 

Kshatriya Kings, across the ages, embody these core values and traditions. Territorial integrity not acquisition remains foremost; common good not self-interest becomes the goal. The Rig-Vedic concept of 'Rashtra-sutra' comes alive in the thoughts, words and deeds of the Suryavanshi Kings.

The ascendancy of Magadha and the rise of the Shakyas is a testimony to the indomitable spirit of  Kshatriya-Kings among whom Bimbisara is  one of the greatest.
Dynastic relations with King Prasenjit-II of Kosala helps Bimbisara expand the empire of Magadha.

Under Ajatshatru, Magadha establishes the monarchical system across the Ganges plain.

The divine nature of Kshatriya kingship is now firmly  entrenched. Elaborate ritual sacrifices - the Rajasuya and the Ashwamedha - are performed by the Kings to affirm their divinity and keep alive the Vedic traditions.