For centuries before the Lê dynasty, the Vietnamese and Lao polities existed side by side and frequently interacted. The Vietnamese chronicles records growing clashes between various Tai polities with the Viet court in the 1320s and 1330s, specifically the Ngưu Hống of Sip Song Chau Tai and the Ailao of Houaphanh and Vientiane. A Vietnamese inscription in Laos, dated 1336, discovered in 1960s by Emile Gaspardone, concerns the defeat of Vietnamese army led by Emperor Trần Minh Tông in a battle against the Ailao chief Souvanna Khamphong, the grandfather of Fa Ngum, in the previous year. In the 15th century, the number of Tai speaking people around Đại Việt was close in number to those speaking Viet. The Ming census of 1417 showed that there were 162,559 households, while Muang Phuan had 90,000 households, according to the Vietnamese chronicle. Adding the population of Lan Xang, a larger polity of the same period would have made the Viet-speaking people a minority in the region. In fact, contemporary records from Lao, Vietnamese and Chinese sources suggest that the central Lao and central Vietnam area during the 14th and 15th century would have been relatively densely populated, more so than the coastal areas of the time.  