The Timurids were descended from the Mongols,the dynasty having been
founded by Timur the Great in the 14th century.Timur was a Turkicized
2 main reasons:
Timur was a Muslim,so the Mughals were emphasizing their Muslim heritage.
Timur was a mighty warrior and conqueror,and much nearer in historical
terms to the Mughals than Genghis Khan,so they were emphasizing their
warrior heritage through a relatively recent example,and the founder of
their dynasty to boot.Further,Timur had been a patron of scholars and
the arts,and had constructed some awesome monuments (which is more than
Genghis and his immediate successors ever did),so the Mughals were
stressing a cultural heritage as well through being Timurid.