Who was the first Sultan of Delhi to issue regular currency and to declare Delhi as the capital of his empire?

Iltutmish was the first Sultan of Delhi to issue regular currency and declare Delhi as the capital of his empire. He was the third ruler of the Delhi Sultanate (1211 – 1236), belonging to the Mamluk dynasty. He conquered Multan and Bengal from contesting rulers, and Ranthambhore and Siwalik from their rulers.