Q. Which sultan enforced the Shariah stringently by not only obtaining a letter of investiture from the caliph but also by pleasing the ulema?
Answer: Firuz Shah Tughlaq
Notes: Firuz Shah Tughlaq enforced Shariah, legitimized his rule with a letter from the Abbasid Caliph, granted land to ulema, abolished un-Islamic taxes, established madrasas, banned alcohol and gambling, and built mosques and public works.

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