After her defeat, Razia Sultan was imprisoned by Malik Ikhtiyaruddin Altunia at:

Razia Sultan was imprisoned by Malik Ikhtiyaruddin Altunia, the governor of Bathinda (Tabarhind), in the Qila Mubarak fort at Bathinda, Punjab, in 1240.

The events:

• Razia faced opposition from the powerful Turkish nobles, who did not want to be ruled by a woman and resented her independent policies.
• In 1240, Altunia, the governor of Bathinda and one of the rebel nobles, revolted against her.
• Razia marched against him, but her army was defeated, and she was captured and imprisoned in the fort of Bathinda.
• Meanwhile, the nobles in Delhi placed her brother, Muizuddin Bahram Shah, on the throne.
• Razia then won over Altunia and married him.
• Together, they marched towards Delhi to regain the throne, but were defeated by Bahram Shah's army.
• While retreating, both Razia and Altunia were killed near Kaithal (in present-day Haryana) in October 1240.

About the Qila Mubarak (Bathinda):

• It is one of the oldest surviving forts in India.
• Its original structure is believed to date back to the early centuries CE (possibly the Kushana period), with the brick fort built and rebuilt over many centuries.
• It was later rebuilt by Sikh rulers of Patiala.
• A part of the fort is associated with Razia's imprisonment.
• It is a protected monument.

About Razia Sultan:

• She was the daughter of Iltutmish, who nominated her as his successor.
• She was the first and only woman ruler of the Delhi Sultanate.
• She was an able ruler: she tried to rule independently, dressed like a man, held court in public, and led her armies.
• Minhaj-us-Siraj praised her as a great sovereign, wise, just, and a protector of her subjects, but noted that she was not born a man.

Why not the other options?

• ✗The Red Fort was built much later, by Shah Jahan.
• ✗Gwalior Fort and Lahore Fort are not linked with her imprisonment.