The Khanate of Kazan (Tatar Cyrillic: Казан ханлыгы, Latin: Qazan xanlığı, Arabic: قازان خانليغى; Russian: Казанское ханство, tr: Kazanskoye khanstvo) was a medieval Tatar state which occupied the territory of former Volga Bulgaria between 1438 and 1552. Its khans were the patrilineal descendants of Toqa Temür, the thirteenth son of Jochi and grandson of Genghis Khan. The khanate covered contemporary Tatarstan, Mari El, Chuvashia, Mordovia, parts of Udmurtia and Bashkortostan; its capital was the city of Kazan. It was one of the successor states of the Golden Horde, and it came to an end when it was conquered by the Tsardom of Russia.

The territory of the khanate comprised the Muslim Bolgar-populated lands of Bolğar, Cükätäw, Kazan, Qaşan duchies and other regions that originally belonged to Volga Bulgaria. The Volga, Kama and Vyatka were the main rivers of the khanate, as well as the major trade ways. The majority of the population were Kazan Tatars (i.e. Muslim Bolgars that adopted the Tatar language). Their self-identity was not restricted to Tatars; many identified themselves as simple Muslims or "the people of Kazan". Islam was the state religion.

Kazan (Russian: Каза́нь; IPA: [kɐˈzanʲ]; Tatar Cyrillic: Казан, Latin: Qazan) is the capital and largest city of the Republic of Tatarstan, Russia. With a population of 1,161,308, it is the eighth most populous city in Russia, while the metropolitan area has a population of 1.57 million (2011).^{[citation needed]} Kazan lies at the confluence of the Volga and Kazanka Rivers in European Russia.

The Kazan Kremlin is a World Heritage Site. In 2005, the Medal "In Commemoration of the 1000th Anniversary of Kazan" was established by Russia to denote this landmark event. The multi-ethnic city is is honored by UNESCO and famous for Muslims and Christians living side-by-side in peace.

In April 2009, the Russian Patent Office granted Kazan the right to brand itself as the "Third Capital" of Russia. In 2009 it was chosen as the "Sports capital of Russia" and it still is referred to as such. The city will host 2013 Summer Universiade, 2015 World Aquatics Championships, and 2018 FIFA World Cup.

The origin of the name Kazan is uncertain. The most accepted legends derive it from the Bulgar Turkic (and also modern Tatar) word qazan, which means 'boiler' or 'cauldron'.

Batu Khan (/ˈbɑːtuː ˈkɑːn/; Mongolian: Бат хан, Russian: хан Батый; c. 1207–1255) was a Mongol ruler and founder of the Ulus of Jochi (or Golden Horde), the sub-khanate of the Mongol Empire. Batu was a son of Jochi and grandson of Genghis Khan. His ulus was the chief state of the Golden Horde (or Kipchak Khanate), which ruled Rus and the Caucasus for around 250 years, after also destroying the armies of Poland and Hungary. "Batu" or "Bat" literally means "firm" in the Mongolian language. After the deaths of Genghis Khan's sons, he became the most respected prince called agha (elder brother) in the Mongol Empire.

After his son Jochi's death, Genghis assigned the latter's appanages to his sons. But the Great Khan installed Batu as Khan of the Ulus of Jochi. He had an elder brother Orda Khan who agreed that Batu should succeed his father. Genghis Khan's youngest brother Temuge attended the coronation ceremony as an official representative of Genghis. When Genghis Khan died in 1227, he left 4,000 Mongol men to Jochi's family. Jochi's lands were divided between Batu and his older brother Orda. Orda's White Horde ruled the lands roughly between the Volga river and Lake Balkhash, while Batu's Horde ruled the lands west of the Volga.

Ivan IV Vasilyevich (Russian:  Ива́н Четвёртый, Васи́льевич​ (help·info), Ivan Chetvyorty, Vasilyevich; 25 August 1530 – 28 March [O.S. 18 March] 1584), known in English as Ivan the Terrible (Russian:  Ива́н Гро́зный​ (help·info), Ivan Grozny; lit. Fearsome), was Grand Prince of Moscow from 1533 until his death. His long reign saw the conquest of the Khanates of Kazan, Astrakhan, and Siberia, transforming Russia into a multiethnic and multiconfessional state spanning almost one billion acres, approximately 4,046,856 km² (1,562,500 sq mi). Ivan managed countless changes in the progression from a medieval state to an empire and emerging regional power, and became the first ruler to be crowned as Tsar of all Russia.

Historic sources present disparate accounts of Ivan's complex personality: he was described as intelligent and devout, yet given to rages and prone to episodic outbreaks of mental illness. On one such outburst Tsar beat and unpremeditatedly killed his groomed and chosen heir Ivan Ivanovich. This led Tsardom to be passed to Tsar's younger son: the weak and intellectually disabledFeodor I of Russia. Ivan's legacy is complex: he was an able diplomat, a patron of arts and trade, founder of the Russia's first Print Yard, but he is also remembered for his paranoiac suspiciousness and cruel persecution of nobility.