Tughlaq Dynasty was basically of Turkish origin. In the year 1321, Ghazi Tughlaq succeeded the throne and was given the title as Ghiyath al-Din Tughlaq. The Tughlaqs were able to withhold their rule for quite some time as they had strong allies like the Turks, Afghans and the Muslim warriors of south Asia. Ghiyath al-Din Tughluq was the one who founded the Tughlaq dynasty in India.The founders' real name was Ghazi Malik and he ruled from 1320 - 1325. He founded the city of Tughlaqabad outside Delhi. He fought battle against Khusrao Khan, who killed the last Khilji ruler. He made successful defense against the Mongols which made him an able ruler and the founder of a dynasty in India. He conquered areas including eastern portion of Bengal, a huge territory.

Death of Ghazi Malik :

In 1324A.D. he turned his attention towards Bengal. He wanted his supremacy over the region therefore he set out in expedition with a large army towards Bengal, having left in charge of the government of Delhi his son Jauna khan, who later ascended to the throne as Muhammad-bin-Tughlaq . The result of this expedition which started in on the month of January, 1324, was a general victory. On his way back to Delhi, the sultan also subjugated king of Tirhut region (N. Bihar). On his return journey he had some alarm of his son's suspicious conducts and about a general disquiet in Delhi. so it happened, when sultan was requested by Jauna Khan to have the elephant ride past him and he granted,...elephants came from a certain direction and the total construction collapsed upon him and his other son Mahmud. Whether he was taken out dead or alive then murdered is a matter of debate. His body was carried in the course of night to the tomb beside the city of Tughlaqabad which he had made.

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Sources:
http://library.kiwix.org/wikipedia_en_all_nopic/A/html/G/h/i/y/Ghiyath_al-Din_Tughluq.html
http://www.indianmirror.com/dynasty/tughlaqdynasty.html