Ulugh Muhammad first came to power following the death of Yeremferden. His main competitor for control of the Horde was his cousin[1] Dawlat Berdi, the son of Yeremferden. For much of his reign Ulugh Muhammad controlled Sarai, and was therefore seen as the more legitimate ruler within the Horde, although it was captured by his rival after the Siege of Sarai in 1420 and held by him for two years.