muhammad bin tughlaq ascended the throne after the death of Ghiyasuddin tughlaq in 1325.
He was one of the most learned sultans of the Delhi sultanate, and had profound knowledge of many subjects such as philosophy, religion, poetry and medicine.
However, he is mostly remembered for his controversial projects:
.Introduction of tonken currency,
.heavy taxation in the doab,
.transfer of capital from delhi to devagiri,
.futile plan to conquer khurasan
.failed qyarachill campaigh.
hope this helps.. :)