 The Tang refused the offer but had to pay them 70,000 pieces of silk to go home.In 840, the Kyrgyz tribe invaded from the north with a force of around 80,000 horsemen, destroying the Uyghur capital at Ordu Baliq and other cities, and killing the Uyghur Khagan, Kürebir (Hesa).The last legitimate khagan, Öge, was assassinated in 847, having spent his 6-year reign in fighting the Kyrgyz and the supporters of his rival Ormïzt, a brother of Kürebir.