However, the real founder of the Crimean Khanate was considered to be Hajji Giray and the oldest coin that bore his name was dated 845 (1441/1442). In the beginning of the century XV, several tribes ran away towards the Middle East, or to the west towards the Crimea and the steppe lands in the north of the Black Sea due to the violent civil conflicts and wars that became intensified within the Golden Horde State. Some of the principal tribal beys joined Hajji Giray. He had always tried to attract the attention and annexation of more tribes from the basin of Volga River. Even after a half century, Eminek Mirza who was one of these beys had stated in one of his letters that "our bey principality exist through this province".
Hajji Giray had established relations of friendship and collaboration with Moscow against the Golden Horde State and he enforced his position. Pursuant to the capture of Istanbul, the Ottomans established dominion in the Straits and the Black Sea. Upon these events, he collaborated with the Ottoman State against the Genoese people. In the summer of 1454, the allied Ottoman-Crimean forces besieged Kefe for the first time. The Genoese people of Kefe had to accept to pay an annual tax to the Ottoman sultan and the Crimean khan. Hajji Giray considered Kefe among his own countries in his capacity as the legal inheritor of the Golden Horde khans.
Like in the Golden Horde State, the greatest weakness of the Crimean khanate was the conviction that the tribal beys by inheritance were the real governors and possessors of the state. The competitions among the tribal chiefs or the dynasty of the khans resulted in the grouping of these tribes against each other and the advance towards a civil war.