Chagatai language
Uzbek can be considered the direct descendant or a later form of Chagatai, the language of great Turkic Central Asian literary development in the realm of Chagatai Khan, Timur (Tamerlane), and the Timurid dynasty (including the early Mughal rulers of India). The language was championed by Ali-Shir Nava'i in the 15th and 16th centuries. Nava'i was the greatest representative of Chagatai language literature. He significantly contributed to the development of the Chagatai language and its direct descendant Uzbek and is widely considered to be the founder of Uzbek literature. Ultimately based on the Karluk variant of the Turkic languages, Chagatai contained large numbers of Persian and Arabic loanwords. By the 19th century it was rarely used for literary composition, but disappeared only in the early 20th century.