Beautiful sculpts! 
At the time of Timur? They look to be Timurid successors? Am I right?
Ottoman Empire 17th century. Sipahis timariots
This type of cavalry was the most widespread in the Ottoman Empire.
The entire land fund of the empire (miri) was divided taking into account tax revenues (reya) for feeding different sizes - timars, zeamets and hassas.
Timar complained to representatives of the military class of the Sultan's charter. Timar could not be sold - but could be easily lost by not fulfilling the terms of service.
This work presents western sipahis - timariots. 6 horses and 12 riders were made.