Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Yujiulü Dengzhu (Chinese: 郁久閭登注; pinyin: Yùjiǔlǘ Dēngzhù, r. 553) was one of the last khagans of the remnant of Rouran.
Reign
He fled to Northern Qi following demise of Yujiulü Anagui in 552 with his son Kangti and Anluochen. His second son Tiefa was raised to throne of Rouran in 552. However he soon died in a battle against Khitans in February 553. Hearing this, Dengzhu was sent back by Emperor Wenxuan of Northern Qi and returned to steppe with his elder son and took over leadership. However he too faced attacks from Tujue which was under rulership of Issik Qaghan. He was murdered by one of his advisors - Afuti (阿富提) and was replaced by Kangti.