The Kaiyuan Tongbao, first cast by the Tang dynasty in 621 AD, became the dominant monetary template across Central Asia for centuries — so dominant that Sogdian merchants and local rulers in the Semirechye region produced their own cast imitations rather than import the originals. These Zhetysu issues are heavier than Tang prototypes by design, reflecting local convention rather than error, and they circulated alongside Sogdian coins through the Silk Road entrepôts of the Chu and Talas river valleys during the period when Arab expansion was actively displacing the older Iranian commercial networks to the west.
The Kaiyuan Tongbao, first cast by the Tang dynasty in 621 AD, became the dominant monetary template across Central Asia for centuries — so dominant that Sogdian merchants and local rulers in the Semirechye region produced their own cast imitations rather than import the originals. These Zhetysu issues are heavier than Tang prototypes by design, reflecting local convention rather than error, and they circulated alongside Sogdian coins through the Silk Road entrepôts of the Chu and Talas river valleys during the period when Arab expansion was actively displacing the older Iranian commercial networks to the west.