[6] His reign saw further rise of Turkic power even to the point calling both Zhou and Qi emperors as his sons.
Emperor Xuan of Northern Zhou created the daughter of his uncle Yuwen Zhao (宇文招) the Princess Qianjin, offering to give her to Taspar in marriage if khagan would be willing to surrender Gao Shaoyi.
After the marriage, Yang then sent the official Heruo Yi (賀若誼) to Tujue to bribe khagan to give up Gao Shaoyi.
In fall 580, Gao Shaoyi was delivered to Northern Zhou's capital Chang'an, and he was exiled to modern Sichuan.
His Chinese wife Qianjin survived him, but Taspar bequeathed the throne of the Empire to Talopien, the son of his elder brother Muqan Qaghan.
His bequest ran contrary to the traditional system of inheritance which demanded the throne to be passed to the son of the eldest brother, in this case Ishbara Qaghan.