Harsha
Reign

As Northern India reverted to small republics and small monarchical states ruled by Gupta rulers after the fall of the prior Gupta Empire, Harsha united the small republics from Punjab to central India, and their representatives crowned him emperor at an assembly in April 606 giving him the title of Maharajadhiraja. Harsha established an empire that brought all of northern India under his rule. The peace and prosperity that prevailed made his court a centre of cosmopolitanism, attracting scholars, artists and religious visitors from far and wide. The Chinese traveller Xuanzang visited the imperial court of Harsha, and wrote a favourable account of him, praising his justice and generosity.

Pulakeshin II repelled an invasion led by Harsha on the banks of Narmada in the winter of 618–619. Pulakeshin then entered into a treaty with Harsha, with the Narmada River designated as the border between the Chalukya Empire and that of Harshavardhana.

Xuanzang describes the event thus:

In 648, Tang Chinese emperor Tang Taizong sent Wang Xuance to India in response to emperor Harsha having sent an ambassador to China. However once in India, he discovered that Harsha had died and the new king Aluonashun (supposedly Arunāsva) attacked Wang and his 30 mounted subordinates. This led to Wang Xuance escaping to Tibet and then mounting a joint expedition of over 7,000 Nepalese mounted infantry and 1,200 Tibetan infantry and attacking Indian state on June 16. The success of this attack won Xuance the prestigious title of the "Grand Master for the Closing Court." He also secured a reported Buddhist relic for China. 2,000 prisoners were taken from Magadha by the Nepali and Tibetan forces under Wang. Tibetan and Chinese writings document describe Wang Xuance's raid on India with Tibetan soldiers. Nepal had been subdued by the Tibetan King Songtsen. The Indian pretender was among the captives. The war happened in 649. Taizong's grave had a statue of the Indian pretender. The pretender's name was recorded in Chinese records as "Na-fu-ti O-lo-na-shuen" (Dinafudi is probably a reference to Tirabhukti).

Xuanzang mentions that Harsha waged wars to bring "the Five Indias under allegiance" in six years. Xuanzang uses the term "Five Indias" (or "Five Indies" in some translations) inconsistently, variously applying it to refer to Harsha's territories in northern India or to the entire subcontinent, grouped around Central India in the four directions. Based on this statement, historians such as R.K. Mookerji and C.V. Vaidya have dated Harsha conquests to 606-612 CE. However, it is now known that Harsha engaged in wars and conquests for several more years. Moreover, whether Xuanzang used the term "Five Indias" to describe Harsha's territory in a narrower or wider sense, his statement is hyperbole it cannot be used to make conclusions about Harsha's actual territory. While Harsha was the most powerful emperor of northern India, he did not rule the entire northern India.
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