Historically, the Lao state is regarded as beginning in 1353 CE with the coronation of Fa Ngum at Luang Prabang. According to local historiography, Fa Ngum brought his Khmer Theravada teacher with him to act as adviser and head priest of the new kingdom. This Khmer monk named Phramaha Pasaman also brought to the kingdom a revered image of the Buddha that became known as the Phra Bang, the namesake of the city of Luang Prabang and the symbol of the Lao kingdom. However, Michel Lorrillard asserts the "complete artificial nature of this narrative" and is rather critical of the historical value of the Fa Ngum story. He instead emphasizes the influence of Buddhism from Chiang Mai. Subsequent alliances with Burma and Thailand helped cement the primacy of Theravada Buddhism in the Laotian kingdom. As attested in inscriptions, King Photisarath (1501–1547) tried to suppress the worship of spirits and further Buddhicize the population. However, the "animistic" elements of Lao Buddhism have over time survived all purification efforts and are still today of crucial importance. Local spirit cults and rituals associated with indigenous ideas of "soul substance" ("khwan") are in most cases seamlessly integrated into Buddhism, and practitioners rarely see them as contradictive. Faced with rugged, isolating geography and the absence of a strong central government, Theravada Buddhism became one of the primary unifying features of Lao culture. This is also attested by the fact laws for governing the monastic order have been an important part of Buddhist statecraft in pre-modern, but also colonial Laos.