Feng Ba
There is historical indication that Yujiulü Hulü (郁久閭斛律) began his rule in May 410 and, the following year, offered a tribute of three thousand horses to the Northern Yan ruler Feng Ba, with a request to marry Feng Ba's daughter, Princess Lelang (樂浪公主), who was probably the daughter of Feng Ba's wife, Princess Sun. Feng Ba's brother, Feng Sufu, suggested refusing the request and sending the daughter of one of Feng Ba's concubines instead, but Feng Ba was apparently convinced that an alliance with Rouran would be beneficial to his state, and agreed to give Princess Lelang in marriage to Yujiulü Hulü in 411.