Taj al-maʾathir 18: Arrival of Sultan Muhammad Ghori in Hindustan.

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When Kutbu-d din heard of the Sultan's march from Ghazna, he was much rejoiced, and advanced as far as Hansi to meet him, and "had the honour of kissing hands, and being distinguished above all the princes of the earth by the endless favours which were lavished on him." In the year 592, H. (1196 A.D.), they marched towards Thangar, and the centre of idolatry and perdition became the abode of glory and splendour, and when the ropes of the royal tent were raised to heaven, the neighbourhood was tinged with an hundred hues by the varied coloured tents which were erected round that fortress, which resembled a hill of iron." "By the aid of God, and by the means of courage and the daily increasing prosperity of the king, that strong castle was taken, which had hitherto remained closed to all the sovereigns and princes of the world."
"Kuwar Pal, the Rai of Thangar, who had prided himself on the numbers of his army and the strength of his castle, when he saw the power of the army opposed to him, fear invaded his breast, and he begged for safety for his life, and, like a slave, kissed the face of the earth with the very roots of his teeth." Upon which he was pardoned and admitted into favour, and, though with the loss of his kingdom, was content that his life was left to him." "The Musulmans, and harbis, and zimmis entered into conditions for paying revenue. The country was purified from the defilement of infidelity, and no opportunity remained for opposition and rebellion."
"The government of Thangar was conferred on Baha'u-d din Tughril," "who was acquainted with matters of administration, and the customs of setting soldiers in array," and who received advice and instruction from his majesty how to comport himself properly in his new appointment.