Kazakh Khanate
Expansion of the Kazakh Khanate

Kasym, son of Janibek, became the khan in 1511 and from that point only the descendants of Janibek Khan ruled Kazakh khanate until its fall. Under his rule, the Kazakh Khanate reached its greatest strength so much that the Nogai Horde, which occupied the territory of modern Western Kazakhstan, became its number one enemy. Kasym successfully captured the Nogai capital Saray-Juk in 1520, pushing the Nogai Horde to the Astrakhan Khanate. Under Kasym Khan, the borders of the Kazakh Khanate expanded and the population reached 1 million people. It was during the reign of Kasym Khan that the Kazakh Khanate gained fame and political weight in the modern Euro-Asian arena. Kasym Khan also became a major patron of the arts, literature, and religion, allowing Islam to hold great political and sociocultural importance among Kazakh society. Under his reign, the Tsardom of Russia also became the first major state to establish diplomatic relations with the Kazakh Khanate. Upon doing so, Kasym Khan established his reputation as a successful leader, as his empire became known in Western Europe as an up-and-coming political entity.

The manuscript of "Tarikh-Safavi", written in Persian by Persian historians, wrote about Kasym Khan, bringing most of the Dasht-i-Kipchak under his absolute control. The manuscript also describes how a Kazakh army of eight thousand soldiers helped Sheibani Khan of Bukhara annex the Iranian city of Khorasan.

Kasym Khan also instituted the first Kazakh code of laws in 1520, called "Қасым ханның қасқа жолы" (transliterated, "Qasym hannyñ qasqa joly" – "Bright Road of Kasym Khan"). Kasym Khan also ratified his alliance with the Timurid leader Babur, particularly after the fall of the Shaybanids, and was thus praised by the Mughals and the populace of Samarqand.

Mirza Muhammad Haidar wrote in his Tarikh-i-Rashidi that:

Kásim Khán subdued the whole of the Dasht-i-Kipchák. His army numbered more than a million men. Excepting Juji Khán, there had never reigned a greater Khan than he in that country.
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