An investigation is provided on the narration of the Buddha's biography in Burmese murals of the Pagan Period (eleventh to thirteenth century ce). It detects a development of the complete account on the subject in the oldest murals of the period at the Patho-hta-mya Temple, which probably predate the earliest known literary counterpart in Pāli, the Jinālaṅkāra, which was most likely composed in Sri-Lanka during the mid-twelfth century ce. The comparison is provided between the biographical account of the Buddha illustrated in Pagan murals and those found in the two main groups of much later vernacular texts compiled in Southeast Asia, namely: Malālamkāravatthu-Tathāgataudanadīpanī particularly prevailing in Burma and representing the later Burmese tradition on narrating the Buddha's biography; and, Pathamasambodhi gaining its popularity over several other parts of Southeast Asia (i.e., Thailand, Laos, Cambodia, Southwestern China and eastern part of the Shan State). The Pagan narrative on the Buddha's life is shown to be far more associated with the Malālamkāravatthu-Tathāgataudanadīpanī than with the Pathamasambodhi, suggesting the first group of texts to be a later product of the longstanding Buddhist tradition existing in Burma at least since the Pagan Period, and the latter of a separate development.