When Alauddin Khalji attacked and captured Ranthambore in 1301, the Rajput ruler of the fort was:

When Alauddin Khalji attacked and captured the fort of Ranthambore in 1301 CE, the ruler was Hammir Dev (Hammiradeva), of the Chauhan (Chahamana) dynasty of Ranthambore.

Background:

• Hammir Dev gave shelter to some Mongol (neo-Muslim) soldiers who had rebelled against Alauddin's generals during the return from the Gujarat campaign.
• He refused to hand them over to Alauddin, which led to the war.

The siege:

• Alauddin first sent his generals Ulugh Khan and Nusrat Khan against Ranthambore.
• Nusrat Khan was killed by a stone from a catapult during the siege, and the Delhi army suffered a setback.
• Alauddin then came himself to lead the siege, which lasted several months.
• Some of Hammir's ministers betrayed him.
• The fort was finally captured in July 1301.
• Hammir Dev died fighting, and the women of the fort performed jauhar.
• This is regarded as the first recorded jauhar in Rajasthan's history.
• The Mongol rebels who had been sheltered also fought to the end.
• Amir Khusrau, who accompanied Alauddin, described the siege.

About Hammir Dev:

• He ruled Ranthambore from about 1283 to 1301.
• He was a brave ruler, and had successfully resisted the attacks of Jalaluddin Khalji earlier.
• His life is celebrated in the Sanskrit poem "Hammira Mahakavya" by the Jain poet Nayachandra Suri (15th century), and in the Hindi poem "Hammir Raso".

About Ranthambore fort:

• It is located in the Sawai Madhopur district of Rajasthan, within the Ranthambore National Park (a tiger reserve).
• It is part of the "Hill Forts of Rajasthan" UNESCO World Heritage Site.

Other Rajput rulers who fought Alauddin:

• Rana Ratan Singh of Chittor.
• Rai Karan (Karna) of Gujarat.
• Kanhadadeva of Jalor.

Why not the other options?

• ✗Rana Ratan Singh ruled Chittor.
• ✗Rai Karan ruled Gujarat.
• ✗Kanhadadeva ruled Jalor.