Alauddin Khilji established Diwan-i-Mustakhraj. To know about the revenue arrears and collect them, he introduced a new department of Diwan-i-Mustakhraj.

The Battle of Tarain took place between Mohammad Ghauri and Prithvi Raj III, the Chauhan (Chahman) Rajput ruler of Delhi.

Although Muhammad Ghori started the Iqta system in India, Iltutmish did the work of running it systematically in India. Qutbuddin Aibak was the first iqtar. The tenure of the iqtadar was a maximum of 3 years. Balban became the ruler of Delhi in 1266 AD and ruled Delhi till 1288 AD.

Balban's policy of Blood and Iron: It is not without significance that out of about 84 year's rule of the Slave Dynasty, Balban's rule lasted for about 40 years i.e. 20 years as 'Naib' or Prime Minister but virtually the Sultan and 20 years as the Sultan of Delhi.

Alauddin Khilji was a militarist and imperialist to the core. He was very ambitious. Alauddin, whose original name was Ali Gurshap, assumed the title Sikandar-i-Sani (Alexander the Second) and proclaimed Delhi as Dar-ul-Khilafa (Seat of the Caliphate).

Alauddin Khalji's conquest of Devagiri. Around 1308, the Delhi Sultanate ruler Alauddin Khalji sent a large army led by his general Malik Kafur to Devagiri, the capital of the Yadava king Ramachandra.

1. Tax increase in Doab  - 1325
2. Transfer of Capital  - 1326
3. circulation of nominal currency  -1329 
4. Khurasan campaign- 1330

Muhammad-bin-Tughlaq was the Turkish Sultan of Delhi. He was known as a 'MAN of knowledge' as he had a great interest in different subjects like, philosphy, mathematics, religion and poetry.

Tughlaqs silver coin was named Adl. However, it was difficult to maintain the supply of gold and silver coins on a large scale. So, Tughlaq replaced those coins and started the circulation of copper and brass coins as the token currency which had the same value of gold or silver coins in 1330-32 CE.

Ibrahim Lodhi was the last ruler of Lodhi Dynasty. He was defeated and killed in the First battle of Panipat in 1526 by Babur. He was the third ruler of Lodhi Dynasty. His grandfather Bahlol Lodhi was the first and founder ruler of this dynasty.