Burmese chronicles report that Pyinbya reigned 846-878; however, they are - not to be regarded as reliable - like most Southeast Asian chronicles of that time. In fact, results in a recalculation with the known date of the accession of King Anawrahta ( 1044 ) that Pyinbya will probably have reigned 874-906. In addition, it set the Burmese sources of that time as the 33rd king of a dynasty founded in the 2nd century represents the other hand, historians now believe that he was one of the first kings of Upper Burma, which was at that time dominated by the Pyu.
Founding of Bagan
According to the Burmese chronicles ascended the throne Pyinbya 846 and founded the city of Bagan in the third year of his reign. The date of the founding of Bagan is specified with 211 of the Burmese calendar, ie on 23 December 849 If you take Anawrahta ascended the throne and subtracting the years of governments before him, to get to 877 as the founding year of Bagan.
The founding of Bagan marks the first Burmese settlement in the valley of the Irrawaddy after the Kingdom Nanchao had some 40 years ago devastated the valley. Subsequently, the Pyu were decimated and warriors from Nanchao remained with their families in the valley. Bagan was a fortified settlement built at a strategic point near a well-irrigated rice-growing area.
The son of Pyinbya, Tannet, succeeded him on the throne.