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In 656, Du Zhenglun was serving as the deputy minister of treasury, when Emperor Taizong's son and successor Emperor Gaozong promoted him to serve as Huangmen Shilang (黃門侍郎), the deputy head of the examination bureau (門下省, Menxia Sheng).
Both Shule and Yutian then also submitted to Tang, allowing the Tang Dynasty to dominate the region until it was briefly seized by Tufan (Tibet) during the reign of Emperor Taizong's son Emperor Gaozong.
Lai Ji (來濟) (610–662) was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reign of Emperor Gaozong.
Li Jingxuan (李敬玄) (615–682), formally Duke Wenxian of Zhao (趙文憲公), was an official of the Chinese dynasty Tang Dynasty, serving as chancellor during the reign of Emperor Gaozong.
Emperor Gaozong ordered withdrawal of Tang forces from the Korean Peninsula entirely and moved the Protectorate General to Pacify the East to Liaodong, allowing Silla to eventually expel Tang out of the Korean Peninsula and unify the parts of the peninsula south of the Taedong River.
(The establishment of Islam in China in 650 stemmed from the delivery of a Quran by Caliph Usman to Tang Emperor Gaozong in 650 and headed by Envoy Sa'ad ibn Abi Waqqas, one of Muhammad's first companions)
Emperor Gaozong order withdrawal of Tang forces from the Korean Peninsula entirely and moved the Protectorate General to Pacify the East to Liaodong (遼東, in modern Liaoyang, Liaoning) and the commandant of Xiongjin (熊津), who governed the former Baekje territory at Sabi, to Geonan (建安, in modern Yingkou, Liaoning), allowing Silla eventually expelled Tang out of the Korean Peninsula and unified the parts of the peninsula south of the Taedong River.
In 666, Emperor Gaozong offered sacrifices to heaven and earth at Mount Tai and, to celebrate the occasion, declared a general pardon -- but specifically exempted from the general pardon anyone who was given a long-term exile.
At one point, to observe naming taboo of the name of Emperor Gaozong's second crown prince Li Xian, Liu Qixian changed his name to Liu Jingxian (different character).
He died later that year, and his son Liu Qixian (who later changed his name to Liu Jingxian to observe naming taboo as to Emperor Gaozong's crown prince Li Xian) inherited his title.
Emperor Gaozong, in anger, arbitrarily declared King Munmu's brother Kim Inmun the king Munmu and commissioned Liu Rengui with an army to attack Silla.
Qianling Mausoleum, tomb of the Emperor Gaozong of Tang and Wu Zetian, in Shaanxi, China
Princess Taiping, finding Li Longji difficult to control, began considering trying to replace him as crown prince with one of two nephews with arguable better claims than Li Longji—Li Longji's older brother Li Chengqi the Prince of Song and his cousin Li Shouli the Prince of Bin, the son of Emperor Zhongzong's older brother Li Xián (note different tone), who had been crown prince at one point during Emperor Gaozong's reign.
At that time, Tufan posed a serious threat to Tang's western prefectures, and Emperor Gaozong made his son Li Xian the Prince of Pei nominally the commandant at Liang Prefecture (涼州, roughly modern Wuwei, Gansu) and made Wei his military advisor.