Answer:

Introduction:
The removal of one's name from the Khutba and the coins was a significant step in the history of medieval India. The ruler who took this step was Muhammad-bin-Tughlaq, who ruled the Delhi Sultanate from 1325 to 1351.

Muhammad-bin-Tughlaq:
Muhammad-bin-Tughlaq was one of the most controversial rulers of the Delhi Sultanate. He was known for his intelligence, education, and administrative skills, but he was also known for his impulsive decisions and erratic behavior. Muhammad-bin-Tughlaq was a patron of learning and arts, and he was a great philosopher himself.

The decision to remove his name from the Khutba and the coins:
In the later part of his reign, Muhammad-bin-Tughlaq ordered his name to be removed from the Khutba and the coins, and instead, he inscribed the name of Khalifa. This decision was taken by him to show his loyalty to the Khalifa, who was the spiritual head of the Islamic world.

The reasons behind this decision:
There were several reasons behind this decision taken by Muhammad-bin-Tughlaq. Some of the reasons were:

1. To appease the Khalifa: Muhammad-bin-Tughlaq was a devout Muslim, and he wanted to show his loyalty to the Khalifa, who was the spiritual head of the Islamic world. By removing his name from the Khutba and the coins, he wanted to show that he was subservient to the Khalifa.

2. To assert his authority: Muhammad-bin-Tughlaq was a powerful ruler, and he wanted to assert his authority over his subjects. By removing his name from the Khutba and the coins, he wanted to show that he was not above the law and that he was subject to the authority of the Khalifa.

3. To promote unity: Muhammad-bin-Tughlaq wanted to promote unity among the Muslims of the Delhi Sultanate. By removing his name from the Khutba and the coins, he wanted to show that he was not a divisive figure and that he was committed to the unity of the Muslim community.

The impact of this decision:
The decision taken by Muhammad-bin-Tughlaq to remove his name from the Khutba and the coins had a significant impact on the Delhi Sultanate. It helped to promote unity among the Muslims of the Delhi Sultanate and showed that the ruler was not above the law. However, it also led to confusion and chaos among the people who were not used to such a change.

Conclusion:
In conclusion, Muhammad-bin-Tughlaq's decision to remove his name from the Khutba and the coins was a significant step in the history of medieval India. It helped to promote unity and showed that the ruler was subject to the authority of the Khalifa. However, it also led to confusion and chaos among the people, and it remains a controversial decision to this day.