Why did Alauddin Khalji take stern measures against the nobility? Mention two such measures.

When Alauddin Khalji came to the throne, he had to face a series of rebellions by the nobles. That is why he took stern measures against the nobility. Two such measures were:

1. The nobles were not allowed to hold parties or festivities or to form marriage alliances without the permission of the Sultan.
2. He established an efficient spy system to Keep a check on the activities of the nobles.