Which of the following Sultans was earlier known as Ali Gurshasp?

Alauddin Khalji also known as Ali Gurshasp born in 1266 AD and ruled as Sultan of Delhi from 1296-1316 AD.
He was the nephew and a son-in-law of his predecessor Jalaluddin. He was the first Muslim ruler to extend his empire right up to the extreme South of India.

He conquered Gujarat, Ranathambor, Mewar, Malwa, Jalore, Warangal and Madurai. He is also famous in history for defeating the Mongols many times. 

Alauddin Khalji’s campaign into South India.

• Delhi was attacked twice, in 1299/1300 and 1302-03. As a defensive measure, Alauddin Khalji raised a large standing army.
• Alauddin constructed a newly constructed garrison town named Siri for his soldiers.
• Alauddin chose to pay his soldiers salaries in cash rather than iqtas. The soldiers would buy their supplies from merchants in Delhi and it was thus feared that merchants would raise their prices. To stop this, Alauddin controlled the prices of goods in Delhi. Prices were carefully surveyed by officers, and merchants who did not sell at the prescribed rates were punished.

 MAP REFERENCE- NCERT