state quickly broke into two halves after the death of Timur. The chronic internal fighting of the Timurids attracted the attention of the Eastern Kipchak-speaking nomadic tribes called Taza Uzbeks who were living to the north of the Aral Sea. In 1501, the Uzbeks began a wholesale invasion of Mawarannahr. Under the leadership of Muhammad Shaybani, the Uzbeks conquered the key cities of Samarkand and Herat in 1505 and 1507, respectively, and founded the Khanate of Bukhara. Uzbek period By 1510, the Uzbeks had completed their conquest of Central Asia, including the territory of the present-day Uzbekistan. Of the states they established, the most powerful, the Khanate of Bukhara, centered on the city of Bukhara. The khanate controlled Mawarannahr, especially the region of Tashkent, the Fergana Valley in the east, and northern Afghanistan. A second Uzbek state, the Khanate of Khiva was established in the oasis of Khorazm at the mouth of the Amu Darya. The Khanate of Bukhara was initially led by the energetic Shaybanid dynasty, the successors of Muhammad Shaybani. The Shaybanids initially competed against Iran for a few years, which was led by the Safavid dynasty, for the rich far-eastern territory of present-day Iran. The struggle with the Safavids also had a religious aspect, because the Uzbeks were Sunni Muslims while Iran was Shia. Shaybani Khan wrote poetry under the pseudonym "Shibani". A collection of poems by Shaybani Khan, written in the Central Asian Turkic literary language, is currently kept in the Topkapi manuscript collection in Istanbul. The manuscript of his philosophical and religious work: "Bahr ul-Khudo", written in the Central Asian Turkic literary language in 1508, is located in London. Shaybani-khan's nephew Ubaydulla Khan was a very educated person, he skillfully recited the Koran and provided it with commentaries in the Turkic language. Ubaydulla himself wrote poetry in Turkic, Persian and Arabic under the literary pseudonym Ubaydiy. A collection of his poems has reached us. The term “92 Uzbek tribes”, which appeared in the fifteenth-century Dasht-i Qipchaq, began to be used with a variety of meanings in the following centuries depending on the political and cultural context. Near the end of the 16th century, the Uzbek states of Bukhara and Khorazm began to weaken because of their endless wars against each other and the Persians and because of strong competition for the throne among the khans in power and their heirs. At the beginning of the