The Great Horde (Uluğ Orda) was a rump state of the Golden Horde that existed from the mid-15th century to 1502. It was centered at the core of the Golden Horde at Sarai. Both the Khanate of Astrakhan and the Khanate of Crimea broke away from the Great Horde throughout its existence, and were hostile to the Great Horde. The defeat of the forces of the Great Horde at the Great Stand on the Ugra River by Ivan III of Russia marked the end of the "Tatar yoke" over Russia. Decline of the Golden Horde The Golden Horde of Jochi had been showing cracks in the 14th century, with periods of chaos within the polity. It was united by Tokhtamysh in the 1390s, but the invasion of Timur during this time further weakened the Horde. The death of Edigu (the last person to ever unite the Horde) in 1419 marked one of the final steps of the decay of the Golden Horde, which fractured into the separate states of the Nogai Khanate, the Kazan Khanate, and later the Kasimov Khanate, which had separated itself from Kazan. Each one of these Khanates claimed to be the legitimate successor to the Golden Horde. The Great Horde itself was centered on the Golden Horde's national center of Sarai, with its territory being led by four tribes - the Qiyat, the Manghud, the Sicivud, and the Qonqirat. The Great Horde was originally simply referred to as the Orda, or Horde, but it became increasingly important for the disparate hordes in the region to be distinguished from each other, which led to the first mention of the "Great Horde" in sources in the 1430s. The name "Great Horde" might have been used to directly link the now greatly reduced administrative center of the Horde to the original greatness of the Golden Horde. Joint rule of Küchük Muhammad and Sayid Ahmad I Starting from the 1430s, both Küchük Muhammad and Sayid Ahmad I were in power within the Horde of Sarai. During this time, the Horde lost control of Crimea as Hacı I Giray (brother of Devlet Berdi, who had previously wrested control of Crimea for himself from the Golden Horde) had kicked out authority from Sarai in August 1449. This is accepted as the way the Crimean Khanate became independent, which kicked off a rivalry between Crimea and the Great Horde. Küchük Muhammad drove out