Who was the first Sultan of Delhi who introduced regular coins and declared Delhi the capital of his empire?

Who among the following established Delhi as the capital of Sultanate?

Who was the first Sultan of Delhi to participate in the public celebration of Holi?

The Delhi Sultan who wrote his memoirs, was :

Which Sultan of Delhi was the first to charge ‘Ghari’ or House-tax?

The Sultan of Delhi who is reputed to have built the biggest network of canals in India was :