Not sure what definition of "benign" you have Singhji.
Does the following constitute benign? These are all facts recorded by the Muslim historians themselves.
Seeing the canonization that success had brought to this magnificent thief, other Moslem rulers profited by his example, though none succeeded in bettering his instruction. In 1186 the Ghuri, a Turkish
tribe of Afghanistan, invaded India, captured the city of Delhi, destroyed its temples, confiscated its wealth, and settled down in its palaces to establish the Sultanate of Delhi- an alien despotism fastened upon northern India for three centuries, and checked only by assassination and revolt.
The first of these bloody sultans, Kutb-dDin Aibak, was a normal specimen of his kind- fanatical, ferocious and merciless. His gifts, as the Mohammedan historian tells us, "were bestowed by hundreds of thousands, and his slaughters likewise were by hundreds of thousands." In one victory of this warrior (who had been purchased as a slave), "fifty thousand men came under the collar of slavery, and the plain became black as pitch with Hindus."
Another sultan, Balban, punished rebels and brigands by casting them under the feet of elephants, or removing their skins, stuffing these with straw, and hanging them from the gates of Delhi. When some Mongol inhabitants who had settled in Delhi, and had been converted to Islam, attempted a rising, Sultan Alau-d-din (the conquerer of Chitor) had all the males- from fifteen to thirty thousand of them- slaughtered in one day.
Sultan Muhammad bin Tughlak acquired the throne by murdering his father, became a great scholar and an elegant writer, dabbled in mathematics, physics and Greek philosophy, surpassed his predecessors in bloodshed and brutality, fed the flesh of a rebel nephew to the rebel's wife and children, ruined the country with reckless inflation, and laid it waste with pillage and murder till the inhabitants fled to the jungle.
He killed so many Hindus that, in the words of a Moslem historian, "there was constantly in front of his royal pavilion and his Civil Court a mound of dead bodies and a heap of corpses, while the sweepers and executioners were wearied out by their work of dragging" the victims "and putting them to death in crowds."
In order to found a new capital at Daulatabad he drove every inhabitant from Delhi and left it a desert; and hearing that a blind man had stayed behind in Delhi, he ordered him to be dragged from the old to the new capital, so that only a leg remained of the wretch when his last journey was finished.
The Sultan complained that the people did not love him, or recognize his undeviating justice. He ruled India for a quarter of a century, and died in bed. His successor, Firoz Shah, invaded Bengal, offered a reward for every Hindu head, paid for 180,000 of them, raided Hindu villages for slaves, and died at the ripe age of eighty. Sultan Ahmad Shah feasted for three days whenever the number of defenseless Hindus slain in his territories in one day reached twenty thousand.