Proper noun
Chach
Former name of Tashkent.
By the 7th century AD, Chach had more than 30 towns and a network of over 50 canals, forming a trade center between the Sogdians and Turkic nomads. Source: Internet
The principality of Chach had a square citadel built around the 5th to 3rd centuries BC, some convert south of the Syr Darya River. Source: Internet
The Shahnameh of Ferdowsi also refers to the city as Chach. Source: Internet