This contribution presents the emergence of some Lhasa Tibetan evidentials from Middle Tibetan deictic motion verb and other. More specifically, it traces the origin of the ‘receptive egophoric’ and ‘sensorial’ past tense markers byungand song from the Middle Tibetan verbs byung ‘to come forth, to occur’ and song ‘to go’. Hongladarom (1995) also mentions the origin of these evidentials, but without providing philological details of the these verbs as they are used throug-hout Tibet’s literary history. I fill this gap by presenting three verbal systems that display discrete stages in this evolution: Middle Tibetan (a 15th century bio-graphy), Modern Literary Tibetan (2 genres, newspapers and tales), and Lhasa Tibetan. Although Modern Literary Tibetan is not diachronically intermediate between Middle Tibetan and Standard Colloquial Tibetan, its generic conserva-tism allows it to be used as such