He ordered all his sons to respectfully serve the Han dynasty generation by generation, and to never turn their backs on it. Yan died in the fifth Tianfeng year (18 CE). He was awarded the posthumous title of 'Faithful and Martial King'. His son, Kang, succeeded him on the throne. At the beginning of Emperor Guangwu's reign (25-57 CE), Kang led the neighboring kingdoms to resist the Xiongnu. He escorted, and protected, more than a thousand people including the officers, the soldiers, the wife and children of the former Protector General. He sent a letter to Hexi (Chinese territory west of the Yellow River) to inquire about the activities of the Middle Kingdom, and personally expressed his attachment to, and admiration for, the Han dynasty. In the fifth Jianwu year (29 CE) the General-in-Chief of Hexi, Dou Rong, following Imperial instructions, bestowed on Kang the titles of: “King of Chinese Suoju, Performer of Heroic Deeds Who Cherishes Virtue [and] Commandant-in-Chief of the Western Regions.” The fifty-five kingdoms were all made dependencies after that. In the ninth year (33 CE) Kang died. He was awarded the posthumous title of “Greatly Accomplished King.” His younger brother, Xian, succeeded him on the throne. Xian attacked and conquered the kingdoms of Jumi (Keriya) and Xiye (Karghalik). He killed both their kings, and installed two sons of his elder brother, Kang, as the kings of Jumi and Xiye. In the fourteenth year (38 CE), together with An, the king of Shanshan (the Lop Nor region), he sent envoys to the Imperial Palace to offer tribute. Following this, the Western Regions were (again) in communication with China. All the kingdoms to the east of the Congling (Pamirs) were dependent on Xian. In the seventeenth year (41 CE), Xian again sent an envoy to present offerings [to the Emperor], and to ask that a Protector General be appointed. The Son of Heaven questioned the Excellency of Works, Dou Rong, about this. He was of the opinion that Xian, and his sons and brothers who had pledged to serve the Han were truly sincere. Therefore, [he suggested that] it would be appropriate to give him higher rank to maintain order and security. The Emperor then, using the same envoy that Xian had sent to him, bestowed upon him the seal and ribbon of “Protector General of the Western Regions,” and gave him chariots, standards, gold, brocades and embroideries.