1414, he used the successor-ship conflict to seize control of Bengal. He repelled an incursion on Bengal by the Jaunpur sultanate in north India. His son, who embraced Islam, and then his grandson ruled after him. In 1433, the latter was assassinated and the Ilyas Shahi dynasty was restored. The dynasty began importing Abyssinian slaves. This population became more significant. They became so important that in 1486 an Abyssinian, Barbak Shahzada, seized power from Jalaluddin Fateh Shah. Barbak Shahzada's dynasty was short, lasting for the next seven years. The last Abyssinian ruler, Shamsuddin Muzaffar Shah, lost power to the Arab principal minister, Alauddin Husain. The initiation in 1493 of the Hussain Shahi dynasty brought a period which has been considered Bengal's golden age. The government was genuinely Bengali and while land ownership remained concentrated in Hindu hands, both religious groups had pivotal roles in the government. The sultanate expanded to acquire Cooch Behar and Kamrup. The Sultanate also dominated Orissa, Tripura and the Arakan region. Babar defeated the Lodhis at Panipat in 1526 and the Mughals established India's greatest state since the time of the Mauryas. But during Sheh Shah Suri's rebellion against the second Mughal ruler Humayan, he triumphed over the Hussain Shahi dynasty's Ghiyasuddin Mahmud Shah in 1538, thus bringing an end to the independent status of Bengal. For a short time Humayun ruled Gaur. Bengal along with other parts of eastern India was ruled by Sheh Shah Suri. He implemented many reforms such as introducing parganas. These were land survey based local tax units. He is most famous for designing the Grand Trunk Road between Calcutta and Punjab. Humayun retook Delhi in 1556. But the Suris continued ruling Bengal until 1564 when they were replaced by the Karrani dynasty. Like the Suris, they were not native to Bengal. They had been raiders whom the Mughal armies had driven eastwards. Turko Afghan rule In 1204 CE, the first Muslim ruler, Muhammad Bakhtiyar Khilji, a Turko Afghan, captured Nadia and established Muslim rule. The political influence of Islam began to spread across Bengal with the conquest of Nadia, the capital city of the Sen ruler Lakshmana. Bakhtiyar captured Nadia in an interesting manner. Being made aware of the presence of a strong army of Lakshmana Sen on the main route to Nadia, Bakhtiyar proceeded instead through the jungle of Jharkhand. He divided his army into several groups, and he