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Timur was born in Transoxiana near the city of Kesh (modern Shahrisabz, Uzbekistan) some 80 kilometres (50 mi) south of Samarkand, part of what was then the Chagatai Khanate. His father, Taraqai, was a minor noble of the Barlas, a Mongolian tribe that had been turkified in many aspects. According to Gerard Chaliand, Timur was a Muslim, and he saw himself as Genghis Khan's heir. Though not a Borjigid or a descendent of Genghis Khan, he clearly sought to invoke the legacy of Genghis Khan's conquests during his lifetime.

It was in this period that Timur reduced the Chagatai khans to the position of figureheads while he ruled in their name. Also during this period, Timur and his brother-in-law Husayn, who were at first fellow fugitives and wanderers in joint adventures, became rivals and antagonists. The relationship between them began to become strained after Husayn abandoned efforts to carry out Timur's orders to finish off Ilya Khoja (former governor of Mawarannah) close to Tishnet.  Timur began to gain a following of people in Balkh, consisting of merchants, fellow tribesmen, Muslim clergy, aristocracy and agricultural workers, because of his kindness in sharing his belongings with them. This contrasted Timur's behavior with that of Husayn, who alienated these people, took many possessions from them via his heavy tax laws and selfishly spent the tax money building elaborate structures. At around 1370 Husayn surrendered to Timur and was later assassinated, which allowed Timur to be formally proclaimed sovereign at Balkh. He married Husayn's wife Saray Mulk Khanum, a descendant of Genghis Khan, allowing him to become imperial ruler of the Chaghatay tribe.  One day Aksak Temur spoke thusly:  "Khan Zudei (in China) rules over the city. We now number fifty to sixty men, so let us elect a leader." So they drove a stake into the ground and said: "We shall run thither and he among us who is the first to reach the stake, may he become our leader". So they ran and Aksak Timur, as he was lame, lagged behind, but before the others reached the stake he threw his cap onto it. Those who arrived first said: "We are the leaders." ["But,"] Aksak Timur said: "My head came in first, I am the leader." Meanwhile, an old man arrived and said: "The leadership should belong to Aksak Timur; your feet have arrived but, before then, his head reached the goal." So they made Aksak Timur their prince.
Timur