Qaghan (759-780 CE) to Manicheism in 762 (detailed of Bögü Qaghan in a suit of armour, kneeling to a Manichean high priest) determination method: SHA-1
Buddhist art of East Turkestan detail (page 13) from Mannerheim - Across Asia from West to East in 1906-08 (1909, 1940, 1969) vol 2 (page 17 crop).jpg.
collection of illuminated letters and borders - in the National Art Library, Victoria and Albert Museum (IA historicalintrod00nati 0) (page 2 crop).jpg.
Qaghan to Manicheism in 762: detail of Bögü Qaghan in a suit of armour, kneeling to a Manichean high priest. 8th century Manichean manuscript (MIK 4979).