Answer:

During Firuz Tughlaq's long reign of 40 years, there was only one rebellion by a noble. The noble who rebelled against Firuz Tughlaq was Malik Shamsuddin Damghanid.

Rebellion by Malik Shamsuddin Damghanid:
Malik Shamsuddin Damghanid was a powerful noble and the governor of Multan during Firuz Tughlaq's reign. He rebelled against Firuz Tughlaq in 1351 AD, towards the end of Firuz Tughlaq's reign.

Reasons for the Rebellion:
1. Oppression and Tyranny: Firuz Tughlaq was known for his oppressive and tyrannical rule. He imposed heavy taxes on the people, which burdened them. Malik Shamsuddin Damghanid, being a governor, may have witnessed the suffering of the people and decided to rebel against Firuz Tughlaq's unjust rule.

2. Power Struggle: Nobles during the Delhi Sultanate often engaged in power struggles to increase their own influence and authority. Malik Shamsuddin Damghanid may have rebelled in an attempt to gain more power and control over his region.

3. Dissatisfaction with Firuz Tughlaq's Administration: Firuz Tughlaq's administration was known for its inefficiency and corruption. Malik Shamsuddin Damghanid, being a governor, may have been dissatisfied with Firuz Tughlaq's administration and rebelled to voice his discontent.

Outcome of the Rebellion:
The rebellion by Malik Shamsuddin Damghanid was suppressed by Firuz Tughlaq's forces. Firuz Tughlaq sent an army led by his son-in-law, Malik Maqbul, to quell the rebellion. Malik Shamsuddin Damghanid was defeated and captured, and he was brought back to Delhi as a prisoner.

Firuz Tughlaq pardoned Malik Shamsuddin Damghanid and allowed him to retain his governorship of Multan. However, this rebellion marked a significant challenge to Firuz Tughlaq's authority and showcased the discontent among the nobles during his reign.

Conclusion:
While Firuz Tughlaq's reign of 40 years was relatively stable, there was one rebellion by a noble. Malik Shamsuddin Damghanid's rebellion was driven by factors such as oppression, power struggles, and dissatisfaction with Firuz Tughlaq's administration. This rebellion was suppressed by Firuz Tughlaq, but it highlighted the challenges he faced in maintaining control over his empire.

B