According to legend, the founding monarch of Ailao was , whose mother was . Jiulong was the youngest son of the mythical
Ao Guang, the
Dragon King of the
Eastern Sea, which explains Ailao’s veneration of dragons. At its height, the state extended approximately 3,000
li from east to west and 4,600
li from north to south. Its domain roughly stretched southward to present-day
Xishuangbanna, westward to the
Salween River, northward to the
Hengduan Mountains, and eastward to the
Erhai Lake region, making it the dominant power among the . The political and cultural center of Ailao was located in the area of the present-day
Ailao Mountains,
Baoshan, Yunnan. During the reign of
Emperor Wu of Han (r. 141 – 87 BCE), envoys were sent to establish contact with the Southwestern Yi in hopes of opening a route to
Tianzhu (present-day India). In the second year of Yuanfeng (109 BCE),
Han forces crossed the
Mekong River and attacked Ailao, establishing the counties of
Zhixitang () and . This campaign marked the end of Ailao’s peak period, and the state entered a phase of decline. In the 27th year of
Emperor Guangwu of the
Eastern Han (51 CE), the Ailao king sent envoys to submit to the
Han court. In the 12th year of
Emperor Ming’s Yongping era (69 CE), succeeded to the Ailao throne and sent his son to the Eastern Han to pay tribute. At that time, Ailao consisted of 77 subordinate settlements, comprising 50,000 households and over 550,000 people. In this year, the Han court established the
Yongchang Commandery using six counties from
Yizhou and Ailao’s territory, recognizing the Ailao king as a tribal chief while appointing officials for administrative governance and hosting grand court ceremonies. In the first year of
Emperor Zhang’s Jianchu era (76 CE), ascended the throne of Ailao and raised troops in rebellion against the
Eastern Han. The rebellion was suppressed, and Leilao was killed. Thereafter, Ailao ceased to exist as an independent state. After its incorporation into the Han, Ailao disappeared from historical records and did not persist as a continuous political entity. ==Historiographical debates and identity==